## anonymous 5 years ago If the sides of a square are lengthened by 5 cm, the area becomes 81 cm^2. Find the length of a side of the original square.

1. Owlfred

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2. anonymous

$\sqrt[20]{(-9)^{20}}$ need to simplify my answer.

3. anonymous

let x be the original length than the new side will be (x+5) Area of a square is side^2 (x+5)^2=81 x^2+10x-56=0 (x+14)(x-4)=0 x=-14 or x=4 clearly -14 cannot be a length so the original length was 4