SOLUTION: If the sides of a square are lengthened by 7cm, the area becomes 121cm^2. Find the length of a side of the original square.

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Question 268163: If the sides of a square are lengthened by 7cm, the area becomes 121cm^2. Find the length of a side of the original square.
Answer by drk(1908) About Me  (Show Source):
You can put this solution on YOUR website!
Area of original square = x^2
Area of new square = (x+7)^2 = 121.
%28x%2B7%29%5E2+=+121
step 1 - tale a square root to get
%28x%2B7%29+=+11
step 2 - subtract 7 to get
x+=+4
length of a side of the original square is 4 cm