### Theory:

The value of the polynomial $$p(x)$$ at $$x=a$$ is $$p(a)$$ acquired when $$x$$ is replaced by $$a$$ ($$a∈R$$).
Example:
Write the value of $$p(x) = x^2+2x-1$$ at $$x = 3$$.

The value of $$p(x)$$ at $$x = 3$$ can be obtained by substituting the point $$x = 3$$ in the polynomial.

Substitute $$x=3$$ in the polynomial $$p(x)$$.

$$p(3) =$$$$3^2+2(3)-1$$

$$=9+6-1$$

$$=14$$.