Question

factorise :(a-2b)^3 +a +2b​

Answer 1

1-2a -2b -3(a+b)²

= 1-2(a+b)-3(a+b)²

=1- 3(a+b) +(a+b) -3(a+b)²

=1[1-3(a+b)]+(a+b)[1-3(a+b)]

=[1-3(a+b)][1+(a+b)]

=(1-3a-3b)(1+a+b)