1. The problem statement, all variables and given/known data Help i have a homework quiz done and i simply can't find out how to do the 3rd problem as we haven't even learned how to do it or maybe my notes aren't good or something , however im close to an A in the class and this would help bring it closer. It asks me: "Find all the zeros of: X^4+3x-18". I have looked around online and only could find the rational theory to solve it( we haven't learned this) and it didnt even work. Im wondering if you guys could help me out. 2. Relevant equations X^4+3x-18 3. The attempt at a solution I tried factoring and stuff i learned in algerba 2 but thats all for quadratic equations how did Isaac Newton even figure this out??? I used an online calculator and was given the roots -2.229 and 1.875 but i dont know how to get those roots.