Suppose we have a function f(x)=0, and we have to find all the real roots of it.

For example, we have some function a.x^4 + b.x^3 + c.x^2 + d.x^1 + e = 0, assume each term can have any coefficient of their own.

We have to find all real values of x satisfying it.

How can we find it? Any help would be appreciated!