Question

AJUTOR....URGENT VA ROOOG "
a) (x-1)(x^2+x+1)-(x+2)(x^2-2x+4)
b) (x+3)(x^2-3x+9)-(x+1)(x^2-x+1)
c) (x-3)(x^2+3x+9)-(x-4)(x^2+4x+16)
d) (x+5)(x^2-5x+25)-(x+6)(x^2-6x+36)

Answer 1

a) (x³+x²+x-x²-x-1)-(x³-2x²+4x+2x²-4x+8)=(x³-1)-(x³+8)=x³-1-x³-8=-9
b) (x³-3x²+9x+3x²-6x+27)-(x³-2x+x+x²-x+1)=(x³+3x+27)-(x³-2x+x²+1)=x³+3x+27-x³+2x-x²-1= 5x-x²+26
c) (x³+3x²+9x-3x²-9x-27)-(x³+4x²+16x-4x²-16x-64)= (x³-27)-(x³-64) = x³-27-x³+64= 37
d) (x³-5x²+25x+5x²-25x+125)-(x³-6x²+36x+6x²-36x+216)=(x³+125)-(x³+216)= x³+125-x³-216= -91