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-3x3+2x2+5x-1 - [(2x2+3x) - (x4-2x3+4x2-7)]=
-3x3+2x2+5x-1 - [2x2+3x -x4+2x3-4x2+7]=
-3x3+2x2+5x-1 -[ x4 +2x3 -2x2+3x+7]=
-3x3+2x2+5x-1 -x4 -2x3 +2x2-3x-7=
-x4 -5x3 +4x2+2x -8
2)a) )(2x4-3x+5)(x3+4x+1)+(x3+2x)(x4-4x2)
(2x7+8x5+2x4 -3x4 -12x2 - 3x + 5x3+20x+5) + (x7-4x5 + 2x5-8x3)=
2x7+8x5+2x4 -3x4 -12x2 - 3x + 5x3+20x+5 + x7-4x5 + 2x5-8x3=
3x7 +6x5-x4-3x3-12x2+17x+5
b)(3x3-2x2+5x+1)(x-2)+(x3+4x2-1)(x2+5x)
(3x4-6x3 -2x3+4x2 +5x2-10x +x-2) + (x5+5x4 +4x4+20x3-x2-5x)=
3x4-6x3 -2x3+4x2 +5x2-10x +x-2 +x5+5x4 +4x4+20x3-x2-5x =
x5 +12x4 +12x3 -8x2 -14x-2