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19 July, 12:22

Vertex form of

y=x^2-4x-9

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Answers (1)
  1. 19 July, 14:10
    0
    Complete the square

    first isolate x terms

    y = (x^2-4x) - 9

    complete square inside (take 1/2 of square of b)

    -4/2=-2, (-2) ^2=4

    add 4-4 inside

    y = (x^2-4x+4-4) - 9

    complete the square

    y = ((x-2) ^2-4) - 9

    y = (x-2) ^2-4-9

    y = (x-2) ^2-13
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