P(x) = x^{4} − 3x^{3} + 27x − 81

P(x) = x^4 − 3x^3 + 27x − 81

x^4 − 3x^3 + 27x − 81 = 0

x^3(x - 3) + 27(x - 3) = 0

(x^3 + 27)(x - 3) = 0

(x + 3)(x^2 + 3x + 9)(x - 3) = 0

x = - 3 x = 3 x^2 + 3x = - 9

x(x + 3) = - 9

x = - 9 x = - 12

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