SOLUTION: the volume of a box must be 315m cube. the length of the box is to be 7m and the hieght is to be 4m more than the width. find the width of the box?

Algebra ->  Length-and-distance -> SOLUTION: the volume of a box must be 315m cube. the length of the box is to be 7m and the hieght is to be 4m more than the width. find the width of the box?      Log On


   

Question 1087345: the volume of a box must be 315m cube. the length of the box is to be 7m and the hieght is to be 4m more than the width. find the width of the box?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
V=L%2AW%2AH
315=%287%29%28W%29%28W%2B4%29
W%5E2%2B4W=45
W%5E2%2B4W%2B4=49
%28W%2B2%29%5E2=49
W%2B2=0+%2B-+7
Only positive solutions make sense,
W=-2%2B7
W=5
and
H=5%2B4=9