Question

expand the following
a) (a-2b-3) ^2
b) (2x-y+3z) ^2
c) (5a+b-3c) ^2
d) (-a+3b+7c) ^2​

Answer 1

(3a+2b)3

Using (a+b)3=a3+b3+3ab(a+b)

=(3a)3+(2b)3+3(3a2b)(3a+2b)

=27a3+8b3+18ab(3a+2b)

=27a3+8b3+57a2b+36ab2