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y=y²
y²-y=0
y(y-1)=0
y=0 ∧ y=1
con y=0 (el punto mas sencillo para evaluar)
P(x,0,z)=(x³(0)z³-3x²,0,z³-4x(0)z³)
P(x,0,z)=(-3x²,0,z³)
x=-3x²
3x²-x=0
x(3x-1)=0
x=0 ∧ x=1/3
z=z³
z³-z=0
z(z²-1)=0
z(z-1)(z+1)=0
z=0 ∧ z=1 ∧ z=-1
P(0,0,0)
o bien P(1/3,0,0)
o bien P(1/3,0,1)
o bien P(1/3,0,-1)
espero te sirva :)