1) (2+b)(3b+2)=6b+4+3b²+2b=8b+4+3b²
(5b-b²)(2+3b)=10b+15b²-2b²-3b³=10b-3b³+13b²
(2-b)(3-5b)=6-10b-3b+5b²=6-7b+5b²
(-3b-4)(2b-5)=-6b²+15b-8b+20=6b²+7b+20
2) 9-(3+a)(2a+3)=9-6a+9+2a²+3a=18-3a+2a²
4a³+(a-a²) (3+4a)=4a³+3a+4a²-3a²-4a³=3a+a²
(1-2x)(2+x)+(1-x)(2-2x)=2+x-4x-2x²+2-2x-2x+2x²=4-7x
(x-3)(x-4)-(x-5)(x-2)=x²-4x-3x+12-x²-5x-5x+10= 22-17x
3)14x+7x²=x(14+7x)
x(x-4)-5(x-4)=x²-4x-5x+20=x²-x+20
4)2(x-3)+x²-3x=2x-6+x²-3x=x²-6-x
3x-6-x(x-2)=3x-6-x²+2x=5x-6-x²