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5 May, 22:23

X^2+4x=15 complete the square

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  1. 5 May, 22:41
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    Step-by-step explanation:

    x^2 + 4x = 15 ... take half of ur x term, then square it, then add to both sides

    x^2 + 4x + 4 = 15 + 4

    (x + 2) ^2 = 19

    sqrt (x + 2) ^2 = sqrt 19

    x + 2 = sqrt 19

    x = - 2 ( + - ) sqrt 19

    so x = - 2 + sqrt 19 or x = - 2 - sqrt 19
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