Question #d5da6

1 Answer
Feb 13, 2018

SA=6x2+36x+22

Explanation:

The surface area of a rectangular prism is given by:

2(hw+hl+wl) where

h is the height, w is the width, and l is the length.

In this case, h=(x1),w=(x+7),l=(x+3).

Plug into the formula:

2((x1)(x+7)+(x1)(x+3)+(x+7)(x+3))

2(x2+6x7+x2+2x3+x2+10x+21)

2(3x2+18x+11)

6x2+36x+22

Yay!