Question 1168331
synthetic division using 
-3/1== -4===-9===36
==1===-7===12===0
so the remainder is x^2-7x+12, which factors into (x-4)(x-3), and the roots are 3 and 4.

{{{graph(300,300,-10,10,-10,10,x^3-4x^2-9x+36)}}}