SOLUTION: The area of a rectangular wall in a classroom is 216 sq ft. Its length is 3 ft shorter than three times its width. Find the length and width of the wall of the classroom.

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Question 623349: The area of a rectangular wall in a classroom is 216 sq ft. Its length is 3 ft shorter than three times its width. Find the length and width of the wall of the classroom.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,  

The area of a rectangular wall in a classroom is 216 sq ft. 

Its length is 3 ft shorter than three times its widthhighlight%28x%29.

Question states***

  x(3x-3) = 216    |Solve for the width x, and list both width and length(3x-3)

   x^2 - x - 72 = 0

        x = 9', throwing out negative solution for unit measure