This program will solve the zeros for a function in the form ax^4+bx^3+cx^2+dx+e=0 using the quartic formula.
When you start the program if you havent already input the values of a,b,c,d,e. press 1 and input the numbers,
then you can press 2 and solve it, and you can see the values of each x if you press 3 when at the main
screen. ive updated the graph function now so it shows all the zeros and all the peaks of the function.