I have two problems on my review that I just cannot seem to remember how to work...If anyone could please help, I would really appreciate it!

1. Use the Rational Zero Test to determine all possible rational zeros of the function and then find all the actual zeros of f(x) = x^3 + 2x^2 - 21x + 18

2. Find all the solutions to f(x) = -8x^4 + 128x^2