(3b-4c)^2 =

(4a+3b)^2 =

(3+2a)^2 =

(9-8c)^2 =

1. (3b-4c)2 = 9b2-24bc+16c2

2. (4a+3b)2 = 16a2+24ab+9b2

3. (3+2a)2 = 9+12a+4a2

4. (9-8c)2 = 81-144c+64c2