SOLUTION: the opposite sides of a square are increased by 8 in and the other two sides decreased by 5 inches, the area of the new rectangle is 11sq in more than the area of the original squa

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Question 1109208: the opposite sides of a square are increased by 8 in and the other two sides decreased by 5 inches, the area of the new rectangle is 11sq in more than the area of the original square. how long was one side of the square?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
x, original side length of square

%28x%2B8%29%28x-5%29-x%5E2=11
Simplify and solve for x.

x%5E2%2B8x-5x-40-x%5E2=11
3x-40=11
3x=51
highlight_green%28x=17%29