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If 2x - 4 (x + 1) = - 12, evaluate x2 - 1.

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  1. 13 May, 05:24
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    2x-4 (x+1) = - 13

    1) we solve this equation:

    2x-4 (x+1) = - 12

    2x-4x-4=-12

    -2x=-12+4

    -2x=-8

    x=-8/-2

    x=4

    2) we evalute x²-1

    x²-1=4²-1=16-1=15

    Answer: 15
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