Identify Coefficients in y=-x² + x + 5: Quadratic Equation Analysis

Quadratic Coefficients with Negative Leading Terms

Identify the coefficients based on the following equation

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

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find the function coefficients
00:03 Every number is actually multiplied by 1
00:25 We'll use the formula to represent a quadratic equation
00:31 We'll compare the formula to our equation and find the coefficients
00:45 And this is the solution to the question

Step-by-step written solution

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1

Understand the problem

Identify the coefficients based on the following equation

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

2

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 .

3

Final Answer

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

Key Points to Remember

Essential concepts to master this topic
  • Standard Form: Match y=ax2+bx+c y = ax^2 + bx + c to identify coefficients
  • Technique: Coefficient of x2 x^2 is -1, so a = -1
  • Check: Verify: y=(1)x2+(1)x+(5)=x2+x+5 y = (-1)x^2 + (1)x + (5) = -x^2 + x + 5

Common Mistakes

Avoid these frequent errors
  • Missing the negative sign on the x² coefficient
    Don't ignore the negative sign in front of x2 x^2 and write a = 1 instead of a = -1! This completely changes the parabola direction from downward to upward. Always look carefully at signs when identifying coefficients.

Practice Quiz

Test your knowledge with interactive questions

What is the value of the coefficient \( c \) in the equation below?

\( 4x^2+9x-2 \)

FAQ

Everything you need to know about this question

Why is a = -1 and not just -x²?

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The coefficient a is the number multiplying x2 x^2 . Since x2=1x2 -x^2 = -1 \cdot x^2 , the coefficient is -1.

What if there's no number in front of x?

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When you see just x x , it means 1x 1x . The coefficient is 1, not 0! The number 1 is always there, even when not written.

How do I remember which coefficient is which?

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Use the pattern: ax2+bx+c ax^2 + bx + c . a goes with x2 x^2 , b goes with x x , and c is the constant (no variable).

What happens if the equation isn't in standard form?

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Rearrange first! Move all terms to one side so it matches ax2+bx+c ax^2 + bx + c exactly. Then identify coefficients in order.

Can coefficients be zero?

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Yes! If a term is missing, its coefficient is 0. For example, y=x2+3 y = x^2 + 3 means a=1,b=0,c=3 a = 1, b = 0, c = 3 .

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