SOLUTION: If the sides of a square are decreased by 3cm, the area is decreased by 81cm2. What were the dimensions of the original square? Thank you for your help on this problem. Daniel H.

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Question 1015319: If the sides of a square are decreased by 3cm, the area is decreased by 81cm2. What were the dimensions of the original square?
Thank you for your help on this problem.
Daniel H. Jack
Answer by ikleyn(52813) About Me  (Show Source):
You can put this solution on YOUR website!
.
If the sides of a square are decreased by 3cm, the area is decreased by 81cm2. What were the dimensions of the original square?
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Your equation is 

%28x%2B3%29%5E2+-+x%5E2 = 81.

Can you solve it yourself?

Hint: apply the formula for the difference of squares.