Given the equation x superscript 4 baseline minus 2 x cubed minus 10 x squared plus 18 x plus 9 equals 0x4−2x3−10x2+18x+9=0, complete the following. a. list all possible rational roots. b. use synthetic division to test several possible rational roots in order to identify one actual root. c. use the root from part (b) to solve the equation. a. list all rational roots that are possible according to the rational zero theorem.