The area, A, of a rectangle is 120x2 + 78x – 90, and the length, l, of the rectangle is 12x + 15. Which of the following gives the width, w, of the rectangle?
9x + 4
10x – 19
10x – 6
8x – 6

Question

The area, A, of a rectangle is 120x2 + 78x – 90, and the length, l, of the rectangle is 12x + 15. Which of the following gives the width, w, of the rectangle?
9x + 4
10x – 19 
10x – 6 
8x – 6

directrix · Answer

The area of the rectangle is the product of the length and width.

Take the area of the rectangle and divide by the length to get the width.

( 120x2 + 78x – 90)/(12x + 15)= ?   @NBatista

anonymous · Answer

2 • (5x - 3)?

directrix · Answer

Yes, that is the same as 10x -6 which is what I got.