Algebra

Can someone help me figure out what formula I am to use for this word problem? I am having a hard time.

If the sides of a square are lengthened by 7cm the area of the square becomes 121cm^2. What is the length of a side of the orgional square?

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asked by Laura
  1. (x+7)^2 =121
    x+7 = +/- 11
    x = 3 or -18
    -18 will not do so use 3

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    posted by Damon
  2. Thank you!

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    posted by Laura

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