Question

rozwiąż równanie x³+5x²-9x-45==0

Answer 1

 x³+5x²-9x-45= 0

x²(x + 5) - 9(x + 5) = 0

(x² - 9)(x  +5) = 0

(x - 3)(x + 3)(x + 5) = 0

x - 3 = 0 lub x + 3 = 0 lub x + 5 = 0

x = 3              x = -3         x = - 5 

Answer 2