The number c is a root of a polynomial p(x), if p(c)=0.
An n-th order polynomial has n complex roots.
Example:
2 is a root of polynomial p(x)=x-2,since p(2)=2-2=0.
1 is a root of polynomial p(x)=x2-3x+2,since p(1)=12-3*1+2=0.
Remember:
A polynomial may not have any real root:p(x)=x2+1 does not have any real root, since p(x)>=1 for all real x.
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