Question

решите уравнение x^3+5x^2=9x+45

Answer 1

$x^3+5x^2=9x+45 \ x^2(x+5)-9(x+5)=0 \ (x+5)(x^2-9)=0 \ (x+5)(x-3)(x+3)=0 \ x_1=-5 \ x_2=3 \ x_3=-3$