How do you combine like terms in #(2ab+9a-4)- (ab+2)#?

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Answer 1 · 2017-01-30T15:03:56

See the entire solution process below:

First, take the terms out of their parenthesis taking special care with the signs:

#2ab + 9a - 4 - ab - 2#

Next, group like terms:

#2ab - ab + 9a - 4 - 2#

#2ab - 1ab + 9a - 4 - 2#

Now, combine like terms:

#(2 - 1)ab + 9a - 6#

#1ab + 9a - 6#

#ab - 9a - 6#