Solve the following polynomial equations for all complex solutions. The following steps must be part of your work: 20. Use the Rational Root Theorem to list the set of potential rational zeros. Use your graphing calculator to find at least one actual rational zero. Use synthetic division to confirm at least one rational zero. Use any other steps that are needed to find all complex zeros, and put them all in a box. x+4x +15x+ 22 = 0 21. x + 4x-17x - 20x+60=0