Polynomial equations

A polynomial equation is an equation of degree n where n is greater than 2. 

Sum of roots taking one at a time = [coefficient of x^(n-1)]/[coefficient of x^n] = an-1/an.
Sum of roots taking r at a time = [(-1)^r]*[coefficient of x^(n-r)]/[coefficient of x^n] = [(-1)^r]*an-r/an

Product of all roots = (-1)^n * [coefficient of x^0]/[coefficient of x^n] = (-1)^n * a1/an.