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 \(p(x)\).
 
\(p(3) = \)\(3^2+2(3)-1\)
 
\(=9+6-1\)
 
\(=14\).