Question

решите уравнение x^3+x^2=9x+9

Answer 1

x²(x+1)=9(x+1)

x²(x+1)-9(x+1)=0

(x+1)(x²-9)=0

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

x1= -1,  x2= -3,   x3= 3