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26 June, 20:31

Solve by transforming into a perfect square trinomial

x squared-14x=15

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  1. 26 June, 21:47
    0
    X^2 - 14 x = 15

    (x - 7) ^2 - 49 = 15

    (x-7) ^2 = 64

    x - 7 = - or + 8

    x = 15 or - 1

    Just take half o the coefficient of x and subtract it squared as above.

    In general

    x^2 + ax = b

    (x + a/2) ^2 - a^2/4 = b
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