SOLUTION: A rectangular window is 10 inches longer than it is wide. If the area of the window is 1200 square inches, find the length and the width.

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Question 313948: A rectangular window is 10 inches longer than it is wide. If the area of the window is 1200 square inches, find the length and the width.
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
W=L+10
A=LW
A=L(L+10)
1,200=L^2+10L
L^2+10L-1,200=0
(L-30)(L+40)=0
L-30=0
L=30 ANS. FOR THE WIDTH.
W=30+10=40 ANS. FOR THE LENGTH.
PROOF:
1,200=30*40
1,200=1,200