Write A Quadratic Function From Its Zeros With Leading Coefficient `1` Worksheet

Algebra 2
Quadratic Functions

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How Will This Worksheet on “Write a Quadratic Function from Its Zeros with Leading Coefficient `1`” Benefit Your Student's Learning?

  • Reinforce understanding of quadratic function roots (zeros).
  • Develop factoring skills for quadratic expressions.
  • Enhance critical thinking through problem-solving.
  • Connect abstract math concepts to real-world Applications.
  • Build foundational knowledge for advanced algebra topics.
  • Foster self-directed learning and problem-solving confidence.
  • Prepare for assessments with quadratic function-related questions.
  • Improve graphical interpretation skills of quadratic functions.

How to Write a Quadratic Function from Its Zeros with Leading Coefficient `1`?

  • A quadratic function with zeros `p` and `q` can be expressed in factored form as `(x−p)(x−q)`.
  • Multiply the factors to expand the quadratic function: `(x−p)(x−q)=x^2−(p+q)x+pq`.
  • Therefore, the quadratic function with zeros `p` and `q` and leading coefficient `1`, is  `y=x^2−(p+q)x+pq`.

Solved Example

Q. Write a quadratic function with zeros 55 and 5-5.\newlineWrite your answer using the variable xx and in standard form with a leading coefficient of 11.\newlineg(x)=g(x) = ______
Solution:
  1. Zeroes Identification: Zeroes of the function: 55 and 5-5. \newlineIdentify the linear factors using the zeros.\newlineIf 55 is a zero, then (x5)(x - 5) is a factor.\newlineIf 5-5 is a zero, then (x+5)(x + 5) is a factor.
  2. Linear Factors: Leading coefficient: 11.\newlineLinear factors: (x5)(x - 5) and (x+5)(x + 5).\newlineThe quadratic function in factored form is f(x)=(x5)(x+5)f(x) = (x - 5)(x + 5).
  3. Factored Form: Expand the factored form to get the standard form. f(x)=(x5)(x+5)=x2+5x5x25f(x) = (x - 5)(x + 5) = x^2 + 5x - 5x - 25.
  4. Expand and Simplify: Combine like terms.\newlinef(x)=x225f(x) = x^2 - 25.
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About Worksheet

Algebra 2
Quadratic Functions

To write a quadratic function when you know its zeros (where the function equals zero), you use those zeros to create the equation. For example, if the zeros are \( p \) and \( q \), the function can be written as \( y = (x - p)(x - q) \). This form directly gives you the quadratic equation without needing any extra information. Use these worksheets to enhance your analytical skills.

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