Question

factorise the following

Answer 1

9(a-2b)²+6(2b-a)
to make 2b-a as a-2b
9(a-2b)²-6(a-2b)
taking 3(a-2b) as a common

3(a-2b) {3(a-2b)-2(1)
3(a-2b). {3a-6b-2}
3a-6b(3a-6b-2)

Answer 2

9(a square+4b-4ab+12b-6a
=9a square+144b-54a-36ab
=9a(a-6)-36b(a-6)
=a=6