Solution equation: x ^ 3 + 5x + 18 = 0

x^3+5x+18=0
x^3+2x^2-2x^2-4x+9x+18=0
x^2(x+2)-2x(x+2)+9(x+2)=0
(x+2)(x^2-2x+9)=0
(x+2)[(x-1)^2+8]=0
So x + 2 = 0, x = - 2

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