Répondre :
x³-6x²+9x-4
=(x³-2x²+x)+(-4x²+8x-4)
=x(x²-2x+1)-4(x²-2x+1)
=x(x-1)²-4(x-1)²
=(x-4)(x-1)²
=(x³-2x²+x)+(-4x²+8x-4)
=x(x²-2x+1)-4(x²-2x+1)
=x(x-1)²-4(x-1)²
=(x-4)(x-1)²