Question

rozwiaz rownanie

x3 + x2 - 9x - 9 =0

Answer 1

x3 + x2 - 9x - 9 =0

x^2(x + 1) - 9(x + 1) = 0

(x + 1)(x^2 - 9) = 0

(x + 1)(x - 3)(x + 3) = 0

x + 1 = 0  lub   x - 3 = 0   lub  x + 3 = 0

x = -1                 x = 3                 x = -3