First, you simplify the sides, pretty straightforward you get x^2 - 3x + 4. Keep in mind that the sum of the roots = -b/a and the product of the roots = c/a. I will put r_1 as a, and r_2 as b. so a + b = -3, and ab = 4. Solve the systems and sub in for a^3 * b + a* b^3