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16 June, 15:45

Complete the square to solve the equation below. x^2+2x-9=15

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  1. 16 June, 17:01
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    Step-by-step explanation:

    x^2+2x-9=15

    x^2+2x=24

    x^2+2x+1=24+1

    (because what you do to one side you do to the other) ^

    (x+1) ^2=25

    (x+1) ^2 - 25=0

    (25 is a perfect square)

    (x+1-5) (x+1+5)

    (x-4) (x+6)

    x=4,-6
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