SOLUTION: If the sides of a sqaure are lengthened by 5cm. and the area becomes 81cm^2. What was the length of the original square?

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Question 330516: If the sides of a sqaure are lengthened by 5cm. and the area becomes 81cm^2. What was the length of the original square?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
let the length of side be x
x=5 will be the new side
(x+5)^2= 81
take square root of both sides
x+5 =9
x=9-5
x=4 cms.