SOLUTION: The area of a rectangle is 120 sq. ft. the length is one less than the width. What is the width of the rectangle.

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Question 210514: The area of a rectangle is 120 sq. ft. the length is one less than the width. What is the width of the rectangle.
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
L=W-1
AREA=LW
120=(W-1)W
120=W^2-W
W^2-W-120=0
W+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
W=(1+-SQRT[-1^2-4*1*-120])/2*1
W=(1+-SQRT[1+480])/2
W=(1+-SQRT481)/2
W=(1+-21.93)/2
W=(1+21.93)/2
W=22.93/2
W=11.465 ANS.
L=11.465-1=10.465 ANS.
PROOF:
11.465*10.465=120
120~120