calculati:

a)32x²+13x-31x²-15-3x+13=

b)2x-(1-x²+x)+(3x+7+2x²)=

c)2x(x+2)-(x+1)²=

d)(7-x)²-(7-x)(7+x)=

e)(x-1)(x+1)(x²+1)×.......×(x la puterea 50+1)=

Am nevoie urgenta de raspuns!!!
Va rog frumoos....