SOLUTION: If the sides of a square are decreased by 3 cm, the area is decreased by 81 cm^2. What were the dimensions of the origional square?
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Question 55157This question is from textbook Beginning Algebra
: If the sides of a square are decreased by 3 cm, the area is decreased by 81 cm^2. What were the dimensions of the origional square?
This question is from textbook Beginning Algebra
Answer by checkley71(8403) (Show Source): You can put this solution on YOUR website!
(X-3)(X-3)=X^2-81
X^2-6X+9=X^2-81
-6X=-81-9
6X=90
X=90/6
X=15
PROOF
(15-3)(15-3)=15*15-81
12*12=225-81
144=144
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