1.(x+3) (x-4) 2.(2x+3) (2x-3) 3.(5a+b) (5a+b) 4.(3p+2q) (3p-2q) 5.(5a-4) (3a-3)

1.x*-4x+3x-12
=×*-x-12
2.4x*-6x+6x-6
4x*-6
3.25a*+5ab+5ab+b*
25a*+10ab+b*
4.9p*-6pq+6pq-4q*
9p*-q*
5.15a*-15a-12a+12
15a*-27a+12