Examples with solutions for The function y=ax²+bx+c: Matching parameters

Exercise #1

y=x2+x+5 y=x^2+x+5

Video Solution

Step-by-Step Solution

To solve this problem, we will identify the parameters of the given quadratic function step-by-step:

  • Step 1: Define the problem statement: We have y=x2+x+5 y = x^2 + x + 5 .
  • Step 2: Identify the standard form of a quadratic function, which is y=ax2+bx+c y = ax^2 + bx + c .
  • Step 3: Compare the given quadratic expression with the standard form to identify the coefficients.

Now, let's analyze the quadratic function provided:

From the given expression y=x2+x+5 y = x^2 + x + 5 :
- The coefficient of x2 x^2 is 1 1 , so a=1 a = 1 .
- The coefficient of x x is 1 1 , so b=1 b = 1 .
- The constant term is 5 5 , so c=5 c = 5 .

Therefore, the parameters of the quadratic function are a=1 a = 1 , b=1 b = 1 , and c=5 c = 5 .

Consequently, the correct choice from the provided options is (a=1,b=1,c=5) (a = 1, b = 1, c = 5) .

Answer

a=1,b=1,c=5 a=1,b=1,c=5

Exercise #2

y=x2+x+5 y=-x^2+x+5

Video Solution

Step-by-Step Solution

To solve the problem of identifying the coefficients in the quadratic function y=x2+x+5 y = -x^2 + x + 5 , we follow these steps:

  • Step 1: Write down the general form of a quadratic equation: y=ax2+bx+c y = ax^2 + bx + c .

  • Step 2: Compare the given equation y=x2+x+5 y = -x^2 + x + 5 to the general form.

  • Step 3: Identify the value of each coefficient:

    • The coefficient of x2 x^2 is 1-1, so a=1 a = -1 .

    • The coefficient of x x is +1+1, so b=1 b = 1 .

    • The constant term is +5+5, so c=5 c = 5 .

Therefore, the parameters of the quadratic function are a=1 a = -1 , b=1 b = 1 , and c=5 c = 5 .

This matches choice 2, confirming the parameters in the quadratic function.

Final Answer: a=1,b=1,c=5 a=-1, b=1, c=5 .

Answer

a=1,b=1,c=5 a=-1,b=1,c=5

Exercise #3

y=3x2+3x4 y=3x^2+3x-4

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Compare the given quadratic function with the standard form.
  • Step 2: Directly identify the coefficients a a , b b , and c c .
  • Step 3: Verify the correct choice from the provided options, if applicable.

Now, let's work through each step:
Step 1: The given quadratic function is y=3x2+3x4 y = 3x^2 + 3x - 4 . The standard form for a quadratic equation is y=ax2+bx+c y = ax^2 + bx + c .
Step 2: By comparing the given equation to the standard form, we can identify the coefficients:
- a=3 a = 3 , from the term 3x2 3x^2 .
- b=3 b = 3 , from the term 3x 3x .
- c=4 c = -4 , from the constant term 4-4.
Step 3: With these values, compare them to the given choices. The choice that matches these values is option 3: a=3,b=3,c=4 a = 3, b = 3, c = -4 .

Therefore, the solution to the problem is a=3,b=3,c=4 a = 3, b = 3, c = -4 .

Answer

a=3,b=3,c=4 a=3,b=3,c=-4

Exercise #4

y=4x2+3 y=-4x^2+3

Video Solution

Step-by-Step Solution

To solve this problem, we'll compare the given quadratic function with its standard form:

  • Step 1: Recognize the given function as y=4x2+3 y = -4x^2 + 3 .
  • Step 2: Write down the standard form of a quadratic function, which is y=ax2+bx+c y = ax^2 + bx + c .
  • Step 3: Match corresponding terms to identify a a , b b , and c c .

Now, let's work through these steps:

Step 1: The given function is y=4x2+3 y = -4x^2 + 3 .

Step 2: The standard form of a quadratic function is y=ax2+bx+c y = ax^2 + bx + c .

Step 3: By direct comparison:
- The coefficient of x2 x^2 in the given expression is 4-4. Therefore, a=4 a = -4 .
- There is no x x term in the given expression, which implies the coefficient b=0 b = 0 .
- The constant term in the given expression is 3 3 , indicating c=3 c = 3 .

Therefore, the solution is a=4 a = -4, b=0 b = 0, c=3 c = 3, which matches with choice 3.

Answer

a=4,b=0,c=3 a=-4,b=0,c=3

Exercise #5

y=3x24 y=-3x^2-4

Video Solution

Step-by-Step Solution

To solve this problem, we will follow these steps:

  • Step 1: Identify the form of a standard quadratic equation.
  • Step 2: Compare the given function with the quadratic standard form.
  • Step 3: Match the coefficients to the given answer choices.

Now, let's work through each step:
Step 1: The standard form of a quadratic function is y=ax2+bx+c y = ax^2 + bx + c .
Step 2: Given the function y=3x24 y = -3x^2 - 4 , we compare this with the standard form:

  • Coefficient a a is associated with x2 x^2 . Here, a=3 a = -3 .
  • Coefficient b b is associated with x x . Since there is no x x term, b=0 b = 0 .
  • The constant term c c is the standalone number, which is c=4 c = -4 .
Step 3: Given the coefficients a=3 a = -3 , b=0 b = 0 , and c=4 c = -4 , match these with the choices provided. The correct choice is Choice 4: a=3,b=0,c=4 a = -3, b = 0, c = -4 .

Therefore, the solution to the problem is a=3,b=0,c=4 a = -3, b = 0, c = -4 .

Answer

a=3,b=0,c=4 a=-3,b=0,c=-4

Exercise #6

y=5x2 y=-5x^2

Video Solution

Step-by-Step Solution

To solve the problem, we'll identify the parameters a a , b b , and c c from the given quadratic function:

  • **Step 1**: Compare the given equation y=5x2 y = -5x^2 with the general quadratic form y=ax2+bx+c y = ax^2 + bx + c .
  • **Step 2**: Note that the coefficient of x2 x^2 is 5-5, hence a=5 a = -5 .
  • **Step 3**: Since there is no x x term, b=0 b = 0 .
  • **Step 4**: Since there is no constant term, c=0 c = 0 .

After identifying the parameters, we conclude:

The parameters for the quadratic function are a=5 a = -5 , b=0 b = 0 , c=0 c = 0 . Therefore, the correct choice is:

The correct answer is a=5,b=0,c=0 a = -5, b = 0, c = 0 .

Answer

a=5,b=0,c=0 a=-5,b=0,c=0

Exercise #7

y=x2+3x+40 y=-x^2+3x+40

Video Solution

Step-by-Step Solution

To solve this problem, we will follow these steps:

  • Step 1: Identify the given quadratic equation and its form.
  • Step 2: Directly match the coefficients of the given equation to the standard form y=ax2+bx+c y = ax^2 + bx + c .
  • Step 3: Compare with the provided choices and select the one that matches.

Now, let's work through each step:
Step 1: The given quadratic equation is y=x2+3x+40 y = -x^2 + 3x + 40 . This matches the form y=ax2+bx+c y = ax^2 + bx + c .

Step 2: By comparing the given equation to the standard form:
- The coefficient a a is the coefficient of x2 x^2 , which is 1-1.
- The coefficient b b is the coefficient of x x , which is 3 3 .
- The coefficient c c is the constant term, which is 40 40 .

Step 3: From the analysis, we identify a=1 a = -1 , b=3 b = 3 , c=40 c = 40 . We compare these with the provided choices.
The correct answer is: a=1,b=3,c=40 a=-1,b=3,c=40

Therefore, the solution to the problem matches choice 4.

Answer

a=1,b=3,c=40 a=-1,b=3,c=40

Exercise #8

y=3x281 y=3x^2-81

Video Solution

Step-by-Step Solution

To solve this problem, we will identify values of aa, bb, and cc in the quadratic function:

  • Step 1: Note the given equation y=3x281y = 3x^2 - 81.
  • Step 2: Compare it to the standard quadratic form y=ax2+bx+cy = ax^2 + bx + c.
  • Step 3: Match coefficients to find aa, bb, and cc.

Now, let's work through each step:
Step 1: The given equation is y=3x281y = 3x^2 - 81.
Step 2: Compare this to the standard form, y=ax2+bx+cy = ax^2 + bx + c. In this equation:
- The coefficient of x2x^2 is 3, hence a=3a = 3.
- There is no xx term, which means b=0b = 0.
- The constant term is 81-81, hence c=81c = -81.

Therefore, the solution to the problem is a=3,b=0,c=81 a = 3, b = 0, c = -81 .

Answer

a=3,b=0,c=81 a=3,b=0,c=-81

Exercise #9

y=x2 y=x^2

Video Solution

Step-by-Step Solution

To solve this problem, let's follow these steps:

  • Step 1: Recognize the standard form of a quadratic equation.
  • Step 2: Match the given function to the standard form.
  • Step 3: Identify each coefficient a a , b b , and c c .

Now, let's work through these steps:

Step 1: The standard form of a quadratic function is y=ax2+bx+c y = ax^2 + bx + c . Our goal is to identify a a , b b , and c c .

Step 2: We are given the function y=x2 y = x^2 . This can be aligned with the standard form as y=1x2+0x+0 y = 1 \cdot x^2 + 0 \cdot x + 0 .

Step 3: By comparing the given function y=x2 y = x^2 with the standard form, we can deduce:
- The coefficient of x2 x^2 is 1, so a=1 a = 1 .
- The linear term coefficient is missing, which implies b=0 b = 0 .
- There is no constant term, so c=0 c = 0 .

Therefore, the coefficients are a=1,b=0,c=0 a = 1, b = 0, c = 0 , corresponding to choice 1.

Answer

a=1,b=0,c=0 a=1,b=0,c=0

Exercise #10

y=2x2+3 y=2x^2+3

Video Solution

Step-by-Step Solution

To solve this problem, we will follow these steps:

  • Step 1: Identify each term in the given function y=2x2+3y = 2x^2 + 3.
  • Step 2: Compare the equation to the standard quadratic form y=ax2+bx+cy = ax^2 + bx + c.
  • Step 3: Determine the coefficients aa, bb, and cc.
  • Step 4: Match these coefficients to the correct multiple-choice option.

Step 1: The given function is y=2x2+3y = 2x^2 + 3. There is no xx term present.

Step 2: Compare this with the standard form y=ax2+bx+cy = ax^2 + bx + c:

  • The coefficient of x2x^2 is a=2a = 2.
  • The coefficient of xx is b=0b = 0 because there is no xx term.
  • The constant term is c=3c = 3.

Step 3: Therefore, the coefficients are a=2a = 2, b=0b = 0, and c=3c = 3.

Step 4: Review the multiple-choice options provided:

  • Choice 1: a=0a = 0, b=2b = 2, c=3c = 3
  • Choice 2: a=0a = 0, b=3b = 3, c=2c = 2
  • Choice 3: a=2a = 2, b=0b = 0, c=3c = 3
  • Choice 4: a=3a = 3, b=0b = 0, c=2c = 2

The correct choice is Choice 3: a=2a = 2, b=0b = 0, c=3c = 3.

Therefore, the solution to the problem is the values a=2a = 2, b=0b = 0, c=3c = 3 which correspond to choice 3.

Answer

a=2,b=0,c=3 a=2,b=0,c=3

Exercise #11

y=x2+10x y=x^2+10x

Video Solution

Step-by-Step Solution

Here we have a quadratic equation.

A quadratic equation is always constructed like this:

 

y=ax2+bx+c y = ax²+bx+c

 

Where a, b, and c are generally already known to us, and the X and Y points need to be discovered.

Firstly, it seems that in this formula we do not have the C,

Therefore, we understand it is equal to 0.

c=0 c = 0

 

a is the coefficient of X², here it does not have a coefficient, therefore

a=1 a = 1

 

b=10 b= 10

is the number that comes before the X that is not squared.

 

Answer

a=1,b=10,c=0 a=1,b=10,c=0

Exercise #12

y=x26x+4 y=x^2-6x+4

Video Solution

Step-by-Step Solution

To solve this problem, we'll clearly delineate the given expression and compare it to the standard quadratic form:

  • Step 1: Recognize the standard form of a quadratic equation as y=ax2+bx+c y = ax^2 + bx + c .
  • Step 2: Compare the given equation y=x26x+4 y = x^2 - 6x + 4 to the standard form.
  • Step 3: Identify coefficients:
    - The coefficient of x2 x^2 is a=1 a = 1 .
    - The coefficient of x x is b=6 b = -6 .
    - The constant term is c=4 c = 4 .

Therefore, the coefficients for the quadratic function y=x26x+4 y = x^2 - 6x + 4 are a=1 a = 1 , b=6 b = -6 , and c=4 c = 4 .

Among the provided choices, choice 3: a=1,b=6,c=4 a=1,b=-6,c=4 is the correct one.

Answer

a=1,b=6,c=4 a=1,b=-6,c=4

Exercise #13

y=2x25x+6 y=2x^2-5x+6

Video Solution

Step-by-Step Solution

In fact, a quadratic equation is composed as follows:

y = ax²-bx-c

 

That is,

a is the coefficient of x², in this case 2.
b is the coefficient of x, in this case 5.
And c is the number without a variable at the end, in this case 6.

Answer

a=2,b=5,c=6 a=2,b=-5,c=6

Exercise #14

y=2x23x6 y=2x^2-3x-6

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Identify the given quadratic function.
  • Match it with the standard form of a quadratic equation y=ax2+bx+cy = ax^2 + bx + c.
  • Extract the values of aa, bb, and cc directly from the comparison.

Now, let's work through each step:
Step 1: The given quadratic function is y=2x23x6y = 2x^2 - 3x - 6.
Step 2: The standard form of a quadratic equation is y=ax2+bx+cy = ax^2 + bx + c.
Step 3: By matching the given quadratic function with the standard form:

- The coefficient of x2x^2 is 22, so a=2a = 2.
- The coefficient of xx is 3-3, so b=3b = -3.
- The constant term is 6-6, so c=6c = -6.

Therefore, the solution to the problem is a=2a = 2, b=3b = -3, c=6c = -6.

Answer

a=2,b=3,c=6 a=2,b=-3,c=-6

Exercise #15

y=5x24x30 y=5x^2-4x-30

Video Solution

Step-by-Step Solution

The given quadratic function is y=5x24x30 y = 5x^2 - 4x - 30 .
To identify the coefficients, let's compare this with the standard form of a quadratic equation, y=ax2+bx+c y = ax^2 + bx + c .

  • Step 1: Compare the terms of the given equation to the standard form.
  • Step 2: Identify each coefficient:
    For ax2 ax^2 , a=5 a = 5 in the term 5x2 5x^2 .
    For bx bx , b=4 b = -4 in the term 4x-4x.
    For the constant term c c , c=30 c = -30 .

Thus, we have identified the coefficients as a=5 a = 5 , b=4 b = -4 , and c=30 c = -30 .

Therefore, the correct answer is a=5,b=4,c=30 a = 5, b = -4, c = -30 .

The correct choice is .

Answer

a=5,b=4,c=30 a=5,b=-4,c=-30

Exercise #16

y=2x2+3x+10 y=-2x^2+3x+10

Video Solution

Step-by-Step Solution

Let's determine the coefficients for the quadratic function given by y=2x2+3x+10 y = -2x^2 + 3x + 10 .

  • Step 1: Identify a a .
    The coefficient of x2 x^2 is 2-2. Thus, a=2 a = -2 .
  • Step 2: Identify b b .
    The coefficient of x x is 33. Thus, b=3 b = 3 .
  • Step 3: Identify c c .
    The constant term is 1010. Thus, c=10 c = 10 .

Comparing these coefficients to the provided choices, the correct answer is:

a=2,b=3,c=10 a = -2, b = 3, c = 10 .

Therefore, the correct choice is Choice 4.

Answer

a=2,b=3,c=10 a=-2,b=3,c=10

Exercise #17

y=3x2+4x+5 y=3x^2+4x+5

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify the given quadratic function.
  • Step 2: Compare it to the standard form y=ax2+bx+c y = ax^2 + bx + c .
  • Step 3: Determine the values of a a , b b , and c c .

Now, let's work through each step:

Step 1: The problem gives us the quadratic function y=3x2+4x+5 y = 3x^2 + 4x + 5 .

Step 2: The standard form of a quadratic function is y=ax2+bx+c y = ax^2 + bx + c .

Step 3: By comparing y=3x2+4x+5 y = 3x^2 + 4x + 5 with y=ax2+bx+c y = ax^2 + bx + c , we find:
- The coefficient of x2 x^2 is a=3 a = 3 .
- The coefficient of x x is b=4 b = 4 .
- The constant term is c=5 c = 5 .

Therefore, the solution to the problem is a=3,b=4,c=5 a = 3, b = 4, c = 5 .

This matches choice 2, which states: a=3,b=4,c=5 a = 3, b = 4, c = 5 .

Answer

a=3,b=4,c=5 a=3,b=4,c=5

Exercise #18

y=5x+3x2 y=5x+3x^2

Video Solution

Step-by-Step Solution

To solve this problem, we need to express the given function y=5x+3x2 y = 5x + 3x^2 in the standard quadratic form y=ax2+bx+c y = ax^2 + bx + c .

Let's match the components of y=5x+3x2 y = 5x + 3x^2 with the standard form:

  • The term 3x23x^2 corresponds to ax2 ax^2 , so a=3 a = 3 .
  • The term 5x5x corresponds to bx bx , so b=5 b = 5 .
  • There is no constant term in the equation, which means c=0 c = 0 .

Therefore, the values of the coefficients are:

  • a=3 a = 3
  • b=5 b = 5
  • c=0 c = 0

From the answer choices given, the correct choice is:

  • Choice 3: a=3,b=5,c=0 a = 3, b = 5, c = 0

Therefore, the solution to the problem is a=3,b=5,c=0 a = 3, b = 5, c = 0 .

Answer

a=3,b=5,c=0 a=3,b=5,c=0

Exercise #19

Determine the values of the coefficients a, b, and c in the quadratic function below:

y=6x6x2+3 y=6x−6x^2+3

Video Solution

Step-by-Step Solution

Let's recall the general form of a quadratic function:

y=ax2+bx+c y=ax^2+bx+c

Examine the given function in the problem:

y=6x6x2+3 y=6x-6x^2+3

Note that in the general form of the quadratic function mentioned above, the terms are arranged from the highest power (which is the quadratic term - power of 2) to the lowest power (which is the free term - power of 0),

Therefore, in order to make it easier to identify the coefficients, we'll apply the commutative property of addition and rearrange the terms of the quadratic function so they are written from highest to lowest power:

y=6x6x2+3y=6x2+6x+3 y=6x-6x^2+3 \\ y=-6x^2+6x+3

We can then identify that the coefficient of the quadratic term, meaning the coefficient of the term with power two: a a is 6 -6 We'll continue and identify that the coefficient of the term with power one: b b is 6 6 and finally we'll identify that the coefficient of the term with power 0, meaning the free term: c c is 3 3

To summarize, the coefficients in the given function are:

a=6,b=6,c=3 a=-6,\hspace{4pt}b=6,\hspace{4pt}c=3

Therefore, the correct answer is answer A.

Note:

The coefficient c c is the free term - and we said before that it's the coefficient of the term with power zero - x0 x^0 this is because any number different from zero raised to the power of zero equals 1:

x0=1 x^0=1 , and therefore we could write the general form of the function above as:

y=ax2+bx+cy=ax2+bx+c1y=ax2+bx1+cx0 y=ax^2+bx+c \\ \downarrow\\ y=ax^2+bx+c\cdot1 \\ \downarrow\\ y=ax^2+bx^1+c x^0

meaning, c c is the coefficient of the term with power 0.

Answer

a=6,b=6,c=3 a=-6,b=6,c=3

Exercise #20

6=6x+2x2 6=6x+2x^2

Video Solution

Step-by-Step Solution

To solve this problem, we'll start by rearranging the given equation:

  • Step 1: Identify the standard quadratic form: y=ax2+bx+cy = ax^2 + bx + c.
  • Step 2: Rearrange 6=6x+2x26 = 6x + 2x^2 to fit ax2+bx+c=0ax^2 + bx + c = 0.
  • Step 3: Identify coefficients aa, bb, and cc.

Now, let's work through each step:
Step 1: The general form we aim for is y=ax2+bx+cy = ax^2 + bx + c.
Step 2: Rearrange the given equation:
Start by rearranging the terms to resemble ax2+bx+c=0ax^2 + bx + c = 0. We write the equation as:
2x2+6x6=0 2x^2 + 6x - 6 = 0

Step 3: Now, comparing this with the standard form ax2+bx+c=0ax^2 + bx + c = 0, we identify the coefficients:
a=2 a = 2
b=6 b = 6
c=6 c = -6

Therefore, the correct parameters for the equation 6=6x+2x2 6 = 6x + 2x^2 are a=2 a = 2 , b=6 b = 6 , and c=6 c = -6 .

Checking against the answer choices, choice 3: (a=2,b=6,c=6)(a=2, b=6, c=-6) matches our result.

Answer

a=2b=6c=6 a=2\\b=6\\c=-6