Question

(ab+bc)²-2ab²c do it with identity

Answer 1

Hope this helps. Ask for any doubts and mention if you find any mistakes.

Answer 2

(ab+bc)^2--2ab^2c

=( ab)^2+(bc)^2+2ab^2c-2ab^2c
=(ab)^2+(bc)^2
means (ab+bc)^2-2ab^2c=(ab)^2+(bc)^2