algebra

If the sides of a square are lengthened by 8 cm, the area becomes 256cm^2. Find the length of a side of the original square.

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  1. original square : x by x
    new square : (x+8) by (x+8)

    so (x+8)^2 = 256
    x+8 = √256 = 16
    x= 8

    original square was 8 by 8

    check: new square is 16 by 16 or 256

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  2. The square root of 256 is 16. Therefore the original square has side lengths of 8.

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