Trzeba skorzystać z wzorów skróconego mnożenia. Pomóżcie... Dam naj.
a) (x²-1)³-(x-1)(x²+1)(x+1)+4x²(x²+1)
b) (3x-1)³-3(x+1)(x²-x+1)+2(x-2)³
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a) (x²-1)³-(x-1)(x²+1)(x+1)+4x²(x²+1)=
x⁶-3x⁴+3x²-1-(x²+1)(x²-1)+4x⁴+4x²=
x⁶-3x⁴+3x²-1-x⁴+1+4x⁴+4x²=
x⁶+7x²
b) (3x-1)³-3(x+1)(x²-x+1)+2(x-2)³=
27x³-27x²+9x-1-3(x³+1)+2(x³-6x²+12x-8)=
27x³-27x²+9x-1-3x³-3+2x³-12x²+24x-16=
26x³-39x²+33x-20