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5 August, 09:51

Find the y-coordinate of the vertex:

f (2) = 2^2 - 4 (2) - 5.

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  1. 5 August, 10:04
    0
    Step-by-step explanation:

    f (2) = 2²-4 (2) - 5

    f (x) = x²-4x-5

    =x²-4x+4-4-5

    = (x-2) ²-9

    vertex is (2,-9)

    y co-ordinate of the vertex is - 9
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