###### Answer: D

###### Difficulty: Hard

This is a perfect problem to use the **Plugging In Numbers (PIN)** strategy. To use this strategy, simply choose a number (not usually 0 or 1) to plug in for x. Plug the number into the given expression and then plug it into each of the answer choices to see which one (or ones) match. A word of caution with this method: Always make sure to check EVERY answer choice. Sometimes, more than one will work and you will need to try a different number in order to determine which answer choice is correct.

Ex. Choose x = 2

= =

A)

B) = = =

C) = = = =

D) = = = = . Yay!!