Standard Form of the Quadratic Function

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Standard Form of the Quadratic Function

The standard form of the quadratic function is:
Y=ax2+bx+cY=ax^2+bx+c

For example:
Y=4x2+3x+15Y=4x^2+3x+15

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Test yourself on standard representation!

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Create an algebraic expression based on the following parameters:

\( a=-1,b=-1,c=-1 \)

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How do you go from standard form to vertex form?

  • We need to find the vertex of the parabola using the formula to find the XX vertex.
  • Let's find the YY vertex.
  • Let's place in the vertex form template the X X vertex instead of PP, the YY vertex instead of CC and the aa instead of aa.

How do you go from standard form to factored form?

  • Let's find the points of intersection of the parabola with the xx axis.
  • Let's place it in the factored form template.

Look!
If we were to realize that in the standard form there is a coefficient for X2X^2 we will place it in the factoring formula before locating the intersection points there, as follows:

y=a×(xt)×(xk) y=a\times(x-t)\times(x-k)


Examples and exercises with solutions of the Standard form of the quadratic function

Exercise #1

Create an algebraic expression based on the following parameters:

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

Video Solution

Step-by-Step Solution

The goal is to express the quadratic equation y=ax2+bx+c y = ax^2 + bx + c using the given parameters a=1 a = -1 , b=1 b = -1 , and c=1 c = -1 .

First, substitute the values of a a , b b , and c c into the standard form:

  • Substituting a=1 a = -1 , the term becomes x2 -x^2 .
  • Substituting b=1 b = -1 , the term becomes x -x .
  • Substituting c=1 c = -1 , the term remains 1-1.

Combine these terms to form the full expression:


y=x2x1 y = -x^2 - x - 1

Therefore, the algebraic expression for the parameters a=1 a = -1 , b=1 b = -1 , and c=1 c = -1 is: x2x1 -x^2 - x - 1 .

Comparing with the given choices, the correct choice is option 4: x2x1 -x^2-x-1

Answer

x2x1 -x^2-x-1

Exercise #2

Create an algebraic expression based on the following parameters:

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

Video Solution

Step-by-Step Solution

To solve the problem of creating an algebraic expression with the given parameters, we will proceed as follows:

  • Step 1: Identify the given coefficients for the quadratic function, which are a=3 a = 3 , b=0 b = 0 , and c=3 c = -3 .
  • Step 2: Substitute these values into the standard quadratic expression y=ax2+bx+c y = ax^2 + bx + c .

Through substitution, the expression becomes:

y=3x2+0x3 y = 3x^2 + 0x - 3

We can further simplify this expression:

y=3x23 y = 3x^2 - 3

Thus, the algebraic expression with the given parameters is y=3x23 y = 3x^2 - 3 .

The correct answer corresponds to choice number 1: 3x23 3x^2-3 .

Therefore, the solution to the problem is

y=3x23 y = 3x^2 - 3

Answer

3x23 3x^2-3

Exercise #3

Create an algebraic expression based on the following parameters:


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

Video Solution

Step-by-Step Solution

To solve this problem, let's form the algebraic expression using the standard quadratic formula:

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

Given are the values:
a=1 a = 1 ,
b=1 b = -1 ,
c=1 c = 1 .

Substituting these values into the formula, we have:
y=1x2+(1)x+1 y = 1 \cdot x^2 + (-1) \cdot x + 1

This simplifies to:
y=x2x+1 y = x^2 - x + 1

Thus, the algebraic expression is x2x+1\boldsymbol{x^2 - x + 1}.

The correct choice from the given options is:

Choice 3: x2x+1 x^2-x+1

Answer

x2x+1 x^2-x+1

Exercise #4

Create an algebraic expression based on the following parameters:


a=1,b=8,c=0 a=-1,b=-8,c=0

Video Solution

Step-by-Step Solution

To solve this problem, we'll start by substituting the given parameters into the standard quadratic formula:

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

The problem gives us the values:

  • a=1 a = -1
  • b=8 b = -8
  • c=0 c = 0

This means we need to replace a a , b b , and c c in the formula:

y=(1)x2+(8)x+0 y = (-1)x^2 + (-8)x + 0

Simplifying this expression further:

  • The term with a a : (-1)x^2\) results in x2 -x^2 .
  • The term with b b : (-8)x\) simplifies to 8x -8x .
  • The term with c c : 0 0 contributes nothing to the expression, so it is omitted.

Thus, the final algebraic expression is:

y=x28x y = -x^2 - 8x

Therefore, the algebraic expression based on the given parameters is

x28x -x^2 - 8x .

Answer

x28x -x^2-8x

Exercise #5

Create an algebraic expression based on the following parameters:

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

Video Solution

Step-by-Step Solution

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

  • Step 1: Substitute the given values a=3 a = 3 , b=0 b = 0 , and c=0 c = 0 into the quadratic function formula y=ax2+bx+c y = ax^2 + bx + c .
  • Step 2: Simplify the expression.

Let's execute these steps:

Step 1: Substitute the values into the formula:
y=3x2+0x+0 y = 3x^2 + 0x + 0

Step 2: Simplify the expression:
Eliminate the terms with zero coefficients to get:
y=3x2 y = 3x^2

Thus, the algebraic expression for the quadratic function with a=3 a = 3 , b=0 b = 0 , and c=0 c = 0 is 3x2 3x^2 .

Therefore, the correct choice from the options provided is choice 1: 3x2 3x^2

Answer

3x2 3x^2

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