SOLUTION: the area of a rectangle is 80 square feet and its length is 1 foot more than 3 times its width.find its width.

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Question 112526: the area of a rectangle is 80 square feet and its length is 1 foot more than 3 times its width.find its width.
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
AREA=L*W
L=3W+1
80=(3W+1)W
80=3W^2+W
3W^2+W-80=0
(3W+16)(W-5)=0
W-5=0
W=5 FEET IS THE ANSWER FOR THE WIDTH.
PROOF
80=(3*5+1)5
80=16*5
80=80