SOLUTION: A fenced-in rectagular region with the dimensions 4 miles by 10 miles is suddenly expanded by the same distance in each dimension. The resulting region is now 72 square miles in si

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Question 864478: A fenced-in rectagular region with the dimensions 4 miles by 10 miles is suddenly expanded by the same distance in each dimension. The resulting region is now 72 square miles in size.
How much distance was added to each dimension? Set up and solve an equation to answer this question.

Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
Let d be the expanded distance in both directions.
%28d%2B4%29%28d%2B10%29=72
d%5E2%2B14d%2B40=72
d%5E2%2B14d-32=0
%28d-2%29%28d%2B16%29=0

The answer to choose is highlight%28d=2%29.