Find roots of a poly without using embedded functions

Ive been trying to find different methods to find the roots of a polynomial with user entered coefficents but ive gotten no where. Any idea how i could use a loop in order to set the value of a symbolic variable to a different value, in order to find the root of said equation. Thank you

[JESUS DAVID ARIZA ROYETH]

why symbolic? if you can use anonymous functions

[Turlough Hughes]

Given the polynomail coefficients you could just use roots.

[Daniel Morris]

I cant use any embedded functions such as roots or fzero

[Jim Riggs]

I guess that the question is unclear.

Are you asking for algorithms to find roots of polynomials?