Simply multiply therms and regroup.
a(a-9b) - 7a(a+b) =
a^2 - 9ab - (7a^2 + 7ab) =
(1-7)a^2 + (-9ab - 7ab) =
-6a^2 - 16ab
Thomas J.
asked • 02/14/16a(a-9b)-7a(a+b)
struggling on combining like terms in this question
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