Proportional Relationships and Slope, I have no idea what to do

Use the x-intercept method to find all real solutions of the equation.x^3-10x^2+27x-18=0

Which of the following represents a number squared is equal to twenty more than nine times that number ? a) x squared = 9x + 20 b) x squared = 20x + 9 c) x squared > 9 + 20x d) x squared = 9 + x + 20

100 points, hi, i’m not sure what to do here,the data doesn’t seem to be quadratic .? can anyone me, in advance