18-24 please help me!!!!! I don't understand how to do this!

18. Find all of the solutions of the polynomial 22. Find all of the solutions of the polynomial equation: x - 3x + 3x2- 3x +2 = 0 equation: 4x - 13x - 21x2 + 78x - 18 = 0 a. x = 1, x = 2, x =ti X = 7 7, 1= 3, x=12i b. x = +1, x =+2 b . * = - 7, X= 3, x=176 C. x =ti, x =#2 d. x = 1, x =12 C. X = 7, x =3, x=+13 19. Find all zeros of the polynomial function: d. x = 2, x = 3, x=12i f(x) = x - 4x +x2+ 8x -6. 23. Find all zeros of the polynomial function: a. x = -3, x = 2, x = ti h(x) = x* +4x + 5x2 + 4x+4 b. x = +1, x = +2, x =+3 a. x = ti, x = -2 (multiplicity 2) C. x = 1, x =3, x =+~2 b. x =12, x = -1 (multiplicity 2) d. x = 1, x = +2, x =-3 C. x = 7, x = 2, x =+12 20. Find all of the solutions of the polynomial equation: x + 2x +9x2 + 18x = 0 d. x =12i, x = -1 (multiplicity 2) a . x = 0, x =-2, x =ti 24. Find all zeros of the polynomial function: b. x = 1, x =+2, x=+3 p(x) =x- 7x2 c. x = 1, x = -2, x=+~3 a. x = 149, x = 0 (multiplicity 2) d. x =0, x =-2, x =13i b. x = 12, x =7 (multiplicity 2) 21. Find all zeros of the polynomial function: C. x = 7, x = 2, x =#N7 g(x) = x*-9x2 +20 a. x = 0, x = -2, x = 10 d. x = 17, x =0 (multiplicity 2) b. x = +4, x =+5 c. x = +2, x=+VS d. x = 2, x = 5, x =+10i