Polynomial root

The root of a polynomial f is a value for x where the polynomial value f(x) is zero.

For example, if the polynomial $f(x)=2x^2+10x-28$ then $f(2)=2\cdot 2^2+10\cdot 2-28=0$, so 2 is a root of this polynomial.

In fact, it can be seen that also -7 is a root of this polynomial.

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