Quadratic Functions: Factored Form

Question 19 • PBCSD_Grade_Forgiveness_1200710_Mathematics_for_College_Algebra_S2_2023

What is the axis of symmetry of the function f(x)=−(x+9)(x−21)?

Answer

x=−15

x=−6

x=6

x=15

The zeros are x = −9 and x = 21. The axis of symmetry is halfway between them: (−9 + 21) / 2 = 6, so the axis is x = 6, choice C.

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Introduction to Quadratic Functions

Quadratic Functions: Standard Form

Quadratic Functions: Vertex Form