Homework: Question 14, 2.5.45 HW Score: 67.330, 0/. x Points: 0 of 6 Solve the given polynomial equation. Use the Rational Zero Theorem, Descartes's Rule of Signs, and possibly the graph of the polynomial function shown by a graphing utility as an aid in obtaining the first root x4 - 3x3 -67x2 -81x - 18= 0 ..... The solution set of the equation x* - 3x -67x -81x - 18 =0 is {} (Simplify your answers. Type exact answers, using radicals as needed. Use a comma to separate your answers as needed. )