tarea

31.- (7x²+2)-(3x2-5)                        32.-(8x²-x)-(7x²+3x)

7x²-3x²=4x²                                        8x²-7x²=x²

2+5=7                                                 -x-3x=-4x

4x²+7                                                 x²-4x

33.-(3x²-2x-1)-(4x²+2x+5)     34.(-3x+x²-1)-(5x+1-3x²)            35(-1+7x²-2x)-(5x+3x²-7)

3x²-4x²=-x²                                  x²+3x²=4x²                                  7x²-3x²=4x²

-2x-2x=-4x                                   -3x-5x=-8x                                  -2x-5x=7x

-1-5=-6                                         -1-1=-2                                        -1+7=6

-x²-4x-6                                         4x²-8x-2                                      4x²-7x+6

36.- (7x³-x²+x-1)-(2x²+3x+6)                 37(5x²-2x+5)-(3x³-x²+5) 

7x³=7x³                                                        3x³=3x³

-x²-2x²=-3x²                                                5x²+x²=6x²

x-3x=-2x                                                       2x-2x=-4x

-1-6=-7                                                        +5-5=0

7x³-3x²-2x-7                                                 3x³+6x²-4x

38.-(3x²-x-7)-(5x³+5-x²+2x)                           39.- (6x³-2x²-3x+1)-(-x³-x²-5x+7)

5x³=5x³                                                                 6x³+x³=7x³

3x²+x²=4x²                                                           -2x²+x²=-x²

-x-2x=-3x                                                           -3x+5x=2x

-7-5=-12                                                              1-7=-6

5x³+4x²-3x-12                                                      7x³-x²+2x-6

40.- (x-3x²+x³+9)-(-8+7x-x²+x³)

X³-x³=0

-3x²+x²=-2x

x- 7x=-6x

9+8=17

-2x²+6x+17