Question

add 3a (a-b+c) ; 2b (a-b+c)

Answer 1

3a(a-b+c)+2b(a-b+c)
=3a×a-3a×b+3a×c+2b×a-2b×b+2b×c
=
$3a ^{2} - 3ab + 3ac + 2ab + 2b {}^{2} + 2bc$
$3a {}^{2} + 2b {}^{2} - 3ab + 2ab + 3ac$
$3a {}^{2} - 2b {}^{2} - 5ab + 3ac$