32)
a)
3(x²-2x-3)-4(2x²-x-1)-5(-x²+x-1)=
3x²-6x-9-8x²+4x+4+5x²-5x+5=
(3x²-8x²+5x²)+(-6x+4x-5x)+(-9+4+5)=
-7x
b)
2x²-5x-2x(x-3)=
2x²-5x-2x²+6x=
(2x²-2x²)+(-5x+6x)=
x
c)
(2x-3)(6x+1)-4x(3x-5)=
12x²+2x-18x-3-12x²+20x=
(12x²-12x²)+(2x-18x+20x)-3=
4x-3
d)
3x²-2x-2(-x+3)+3(1-x²)=
3x²-2x-2(3-x)+3(1-x²)=
3x²-2x-6+2x+3-3x²=
(3x²-3x²)+(-2x+2x)+(-6+3)=
-3
