x ( 2x + 1 ) - x ² ( x + 2 ) + ( x ³ - x + 3 )
= 2x²+x-x³-2x²+x³-x+3
=(2x²-2x²)+(x-x)-(x³+x³)+3
=3
4−(x−6)−x²(2+3x)+x(5x−4)+3x²(x−1)b)4-(x-6)-x²(2+3x)+x(5x-4)+3x²(x-1)
=4−x+6−2x2−3x3+5x2−4x+3x3−3x2
=4-x+6-2x2-3x3+5x2-4x+3x3-3x2
=(−x−4x)+(−2x2+5x2−3x2)+(3x3−3x3)+(6+4)
=(-x-4x)+(-2x2+5x2-3x2)+(3x3-3x3)+(6+4)
=−5x+10