Question

9х(в кубе)-18х(в квадрате)-х+2=0

Answer 1

9x^3-18x^2-x+2=0, 9x^2(x-2)-(x-2)=0, (x-2)(9x^2-1)=0,

x-2=0, x1=2

9x^2-1=0, 9x^2=1, x^2=1/9, x2,3=+-1/3