SOLUTION: A rectangular area of 40 square miles has a length equal to three times the width less 2 miles. Find the dimensions of this area.

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Question 239474: A rectangular area of 40 square miles has a length equal to three times the width less 2 miles. Find the dimensions of this area.
Answer by checkley77(12569) About Me  (Show Source):
You can put this solution on YOUR website!
L=3W-2
LW=40
(3W-2)W=40
3W^2-2W=40
3W^2-2W-40=0
(3W+10)(W-4)=0
W-4=0
W=4 ANS.
L=3*4-2
L=12-2
L=10 ANS.
PROOF:
4*10=40
40=40