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algebra

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Please help:


If the sides of a square are lingthened by 7cm, the area becomes 169cm^2. Fine thelength of a side of the orginal square.

  • algebra -

    If the original side is s,

    (s+7)^2 = 169 = 13^2

    s+7 = 13
    s = 6

    s = -20 also satisfies the original equation, but does not fit the real world.

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