Решить уравнение x³ - 4 x² - 9 x + 36 = 0

Question

Решить уравнение x³ - 4 x² - 9 x + 36 = 0

Answer 1

X^2(x-4) - 9(x-4) = 0
(x-4) (x^2-9 ) =0
x1 = 4; x2,3=+-3

Comments

x-4 = 0; x1 = 4; x2.3 = (x-3) (x+3); x-3 =0; x2=3; x+3=0; x3=-3

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спасибо