Question

The polynomial x^3 + 5x^2 -57x -189 expresses the volume, in cubic inches, of a shipping box, and the width is (x+3) in. If the width of the box is 15 in., what are the other two dimensions? ( Hint: The height is greater than the depth.)

A.
height: 19 in.
depth: 5 in.

B.
height: 21 in.
depth: 5 in.

C.
height: 19 in.
depth: 7 in.

D.
height: 21 in.
depth: 7 in.