Question

90 POINTS PLEASE HELP

The volume of a rectangular prism is 2x^3+9x^2-8x-36 with height x+2 Using synthetic division, what is the area of the base?

A. 2x^3+13x^2+18x

B. 2x^3+5x^2-18x

C. 2x^2+13x+18

D. 2x^2+5x-18

Answer 1

Formula

Volume = A_base * height

Solution

Synthetic Division always changes signs of the divisor. Also you add whereas in long division you subtract.

-2 || 2 + 9 - 8 - 36

-4 -10 36

===================

2 5 -18 0

You can eliminate A and B. You are never left with the same power at the beginning when you do a division.

What you are left with is

A_Base = 2x^2 + 5x - 18

Answer: D