Question

Aratati ca : (x-1)($x^{2}$-1) -4(x+1)=[tex]
(x+1)^{2} [/tex](x-3)

Answer 1

⇒x³-x-x²+1-4x-4=(x²+2x+1)(x-3)
x³-x²-5x+1=x³-3x²+2x²-6x+x-3
x³-x²-5x+1=x³-x²-5x-3
x³-x³-x²+x²-5x+5x=-3-1
0=-4 deci ec. nu are solutii