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15 February, 15:49

Solve by completing the square: x^2+15=8x

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  1. 15 February, 16:59
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    x^2+15=8x

    x^2-8x=-15

    x^2 - 2 (x) (4) = - 15

    adding 16 on both sides

    x^2 - 2 (x) (4) + 16=-15+16

    x^2 - 2 (x) (4) + 4^2 = 1

    (x-4) ^2=1

    taking square root on bothsides x-4 = + - 1

    so x-4=1 or x-4=-1

    x-5 or x=3
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