SOLUTION: The area is a rectangular pool, 10m long and 3m wide, it doubles if it's length and width are increased by the same ammount. Calculate the new dimensions. Thanks for the help

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Question 264595: The area is a rectangular pool, 10m long and 3m wide, it doubles if it's length and width are increased by the same ammount. Calculate the new dimensions. Thanks for the help
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
10*3=30 M^2 SIZE OF THE POOL.
(10+X)(3+X)=2*30
30+3X+10X+X^2=60
X^2+13X+30-60=0
X^2+13X-30=0
(X+15)(X-2)=0
X-2=0
X=2 ANS.
PROOF:
(10+2)(3+2)=2*30
12*5=60
60=60