Answers

2015-07-19T20:32:52+08:00
64m² the side of each is 8, so the original size is 5 because it was increased by 3
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2015-07-19T20:33:52+08:00

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(x+3)² = 64
x+3  = +/- √64 
But we only get the positive value since a length is never negative.
x + 3 = 8
x = 5

Therefore the original length is 5m.
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