Question

Factorise : a²+4b²-3a+6b-4ab

Answer 1

a^2+4b^2+4ab-3a+6b

a^2+(2b)^2+2*a*2b-3(a+2b)

(a+2b)^2-3(a+2b)

(a+2b)(a+2b-3)