Question

Expand the following using suitable identities:

(i) (3a − 7b + c)
^2
Please answer me​

Answer 1

............................don't knpw

Answer 2

Answer:

(a+b+c) ^2=a^2+b^2+c^2+2ab+2bc+2ca

(3a-7b+c)^2=(3a)^2+(-7b)^2+c^2+2*3a*(-7b)+2*(-7b)*c+2*c*3a

(3a-7b+c)^2=9b^2+49b^2+c^2-42ab-14bc+6ca

Hope it is helpful