tarea de algebra 4

1: (7x2+2)-(3x2-5)=
7x2+2-3x2+5
7-3=4x2
2+5=7
R=4x2+7
2: (8x2-x)-(7x2+3x)=
8x2-x-7x2-3x
8-7=1x2
-1-3=-4x
R=1x2-4x
3: ( 3x2-2x-1)-(4x2+2x+5)=
3x2-2x-1-4x2-2x-5
3-4=-1x2
-2-2=-4x
-1-5=-6
R=-1x2-4x-6
4: (-3x+x2-1)-(5x+1-3x2)=
-3x+x2-1-5x-1+3x2
1+3=4x2
-3-5=-8x
-1+1=0
R= 4x2-8x+0
5: (-1+7x2-2x)-(5x+3x2-7)
-1+7x2-2x-5x-3x2+7
7-3=4x2
-2-5=-7x
-1+7=6
R= 4x2-7x+6
6: (7x3-x2+x-1)-(2x2+3x+6)=
7x3-x2+x-1-2x2-3x-6
7x3
-1-2=-3x2
1-3=-2x
-1-6=-7
R=7x3-3x2-2x-7
7: (5x2-2x+5)-(3x3-x2+5)=
5x2-2x+5-3x3+x2-5
-3x3
5+1=6x2
-2x
5-5=0
R=-3x+6x2-2x+0
8: (3x2-x-7)-(5x3+5-x2+2x)=
3x2-x-7-5x3-5+x2-2x
-5x3
3+1=4x2
-1-2=-3x
-7-5=-12 R=-5x3+4x2-3x-12
9: (6x3-2x2-3x+1)-(-x3-x2-5x+7)=
6x3-2x2-3x+1+x3+x2+5x-7
6+1=7x3
-2+1=-1x2
-3+5=2x
1-7=-6
R=7x3-1x2+2x-6
10: ( x-3x2+x3+9)-(-8+7x-x2+x3)=
x-3x2+x3+9+8-7x+x2-x3
1-1=0x3
-3+1=-2x2
1-7=-6x
9+8=17
R= 0x3-2x2-6x+17