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14 July, 04:12

Solve by factoring. x2 - 49 = 0

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  1. 14 July, 04:33
    0
    Remember

    difference of 2 perfect squares

    a^2-b^2 = (a-b) (a+b)

    (x) ^2 - (7) ^2 = (x-7) (x+7)

    set to zero

    x-7=0

    x=7

    x+7=0

    x=-7

    x=-7 or 7
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