By Vieta's formulas, for 3x3+2x2−x+4=03x^3 + 2x^2 - x + 4 = 03x3+2x2−x+4=0 with roots r1,r2,r3r_1, r_2, r_3r1,r2,r3, find r1r2r3r_1 r_2 r_3r1r2r3.
frac43\\frac{4}{3}frac43
−frac43-\\frac{4}{3}−frac43
frac23\\frac{2}{3}frac23
444