Question
Add: $3a(a - b + c), 2b(a - b + c)$
✓
Answer
$ 3 a(a-b+c)+2 b(a-b+c) $
$ =\left(3 a^2-3 a b+3 a c\right)+\left(2 a b-2 b^2+2 b c\right) $
$ =3 a^2-3 a b+2 a b+3 a c+2 b c-2 b^2 $
$ =3 a^2-a b+3 a c+2 b c-2 b^2 $
$ =\left(3 a^2-3 a b+3 a c\right)+\left(2 a b-2 b^2+2 b c\right) $
$ =3 a^2-3 a b+2 a b+3 a c+2 b c-2 b^2 $
$ =3 a^2-a b+3 a c+2 b c-2 b^2 $
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