X^3+x^2-x-1= 0 решите плиз

Question

X^3+x^2-x-1= 0 решите плиз

Answer 1

x³+x²-x-1= 0

х²(х+1) - (х+1) = 0

(х+1)(х²-1) = 0

(х+1)(х+1)(х-1) = 0

х₁ = -1

х₂ = 1