Question

Which expression is not equivalent to the other three?

Answer 1

2x + 2+ 2x + 3x – 8
4 + 7x – 2
–2 + 5x + 2x – 4
8x – x – 6

Answer 2

for each expression, you should combine like terms. after you're done, you should get three that are equal, and one that is different.
I'll walk through the first answer choice to help you get started.

2x + 2+ 2x + 3x – 8

notice how you have 2x + 2x + 3x. 2+2+3= 7, so 2x + 2x + 3x = 7x
all that's left is 2 - 8. 2 - 8 is just -6.

so putting them together, 7x - 6. **** important note **** 7x and -6 are not like terms, so you cannot combine them.

repeat this process with the other three choices.