How do you combine like terms in #-3+ 7x + 4+ ( - 9x ) #?

1 Answer
Y
May 14, 2017

Answer: #1-2x#

Explanation:

We can only combine (add/subtract) terms with the same variable of the same degree. Here, #-3# and #4# are both constants (no variable) and #7x# and #-9x# have the same variable (#x#) to the first degree.

Therefore,
#-3+7x+4-9x#
By rearranging:
#=-3+4+7x-9x#
#=1-2x#

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