Question

6ab+3a-10b-5
a^2-6ab+9b^2
4x^2+20x+25
-18x^2+12x-3xy+2y

Answer 1

3a(2b+1)-5(2b+1)
(a-3b)^2
(2x+5)^2
12x(1-1,5x)+2y(1-1,5x)