Question

Finding the Vertex
What is the vertex of the quadratic function f(x) = (x – 8)(x - 2)?

Answer 1

Answer: 5,-9

Explanation:

Answer 2

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Answer:

(5, -9)

Explanation:

The zeros are x=8 and x=2. The x-coordinate of the vertex is the average of these:

x = (8+2)/2 = 5

The y-coordinate is f(5).

f(5) = (5 -8)(5 -2) = (-3)(3) = -9

The vertex is (5, -9).