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25 November, 03:19

Consider the quadratic function

f (x) = x^2-8x-9

Vertex: (-b/2a, f (-b/2a))

What is the vertex of the function (__,__)

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  1. 25 November, 06:40
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    (9,-1) (-1,9)

    Step-by-step explanation:

    f (x) = x²-8x-9

    f (x) = x²+x-9x-9

    f (x) = (x²+x) (-9x-9)

    x (x+1) - 9 (x+1)

    (x-9) (x+1) = 0

    x=9 or X=-1
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