|
||||||||||||
|
||||||||||||
| ||||||||||||
The area of a rectangle is the length times the width. You have a length of $w - 15$ units and a width od $w + 15$ units and hence the area is $(w - 15) \times (w + 15)$ square units. But the problem states that the area is 864 square units and thus \[(w - 15) \times (w + 15) = 864.\] Expand the left side and solve for $w.$ Penny | ||||||||||||
|
||||||||||||
Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. |