Question

Calculati:
a) (x+2)(x²-x+3)-(x+1)(x²+2x-5)
b) (2x+1)(x²-2x+4)-(x-3)(2x²+x-3)
c) (x-3)(x²-3x+2)-(x+3)(x²-x-1)
URGENT VA ROOG!!

Answer 1

a) (x+2)(x²-x+3)-(x+1)(x²+2x-5) =
=x³+2x²-x²-2x+3x+6-x³-x²-2x²-2x+5x+5=
=-2x²+4x+11

b) (2x+1)(x²-2x+4)-(x-3)(2x²+x-3)
=2x³+x²-4x²-2x+8x+4-2x³+6x²-x²+3x+3x-9=
=2x²+12x-5

c) (x-3)(x²-3x+2)-(x+3)(x²-x-1)=
=x³-3x²-3x²+9x+2x-6-x³-3x²+x²+3x+x+3=
=-8x²+15x-3