SOLUTION: The height of a box is 5 inches. The length is three inches more than the width. Find the width if the volume is 90 cubic inches.

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Question 574950: The height of a box is 5 inches. The length is three inches more than the width. Find the width if the volume is 90 cubic inches.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
The height of a box is 5 inches.
The length is three inches more than the width.
Find the width if the volume is 90 cubic inches.
:
L * W * H = 90
(W+3) * W * 5 = 90
Divide both sides by 5
W(W+3) = 18
W^2 + 3W - 18 = 0
Factors to
(W+6)(W-3) = 0
The positive solution
W = 3 inches is the width
;
:
:
CHeck: (3+3) * 3 * 5 = 90