18+x^3-2x^2-9x=0pleasee

Question

18+x^3-2x^2-9x=0
pleasee

Answer 1

(18 -9x) -(2x² -x^3) =0

9(2 -x) -x²(2 -x) =0

(2 -x)(9 -x²) =0

2 -x =0; x =2

9 -x² =0; x² =9; x=+-3

ответ: x=2; x=+-3