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25 June, 10:03

Each side of a square is increased 7 inches. when this happens, the area is multiplied by 4. how many inches in the side of the original square?

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  1. 25 June, 10:20
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    Hello,

    Assume x the side of the square.

    (x+7) ²=4x²

    ==> ((x+7) - 2x) ((x+7) + 2x) = 0

    ==> (-x+7) (3x+7) = 0

    ==> x=7 or x=-7/3 (to exclude since side must be positive)

    Proof:

    (7+7) ²=196

    4*49=196
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