Bonjour,
z³+z²-2=z³-z²+2z²-2
=z²(z-1)+2(z²-1)
=z²(z-1)+2(z-1)(z+1)
=(z-1)(z²+2z+2)
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Bonjour,
z³+z²-2=z³-z²+2z²-2
=z²(z-1)+2(z²-1)
=z²(z-1)+2(z-1)(z+1)
=(z-1)(z²+2z+2)