How do you combine like terms in #2a + 3a b - 7a b + 4a - 9b#?

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Answer 1 · 2018-04-26T17:59:30

#6a -4ab -9b#

Given: #2a + 3ab - 7ab +4a -9b#

The sign before the number always accompanies the number.

Like terms:

#2a " & "4a: " "2a + 4a = 6a#

#3ab " & "-7ab: " "3ab - 7ab = -4ab#

There is only one #b# term: #-9b#

Adding like terms gives the following result:

#2a + 3ab - 7ab +4a -9b = 6a -4ab -9b#