for 
at x = 2.Evaluation of a function:
Evaluate for at x = 2.
In the first term in the numerator, we substitute the quantity
in place of x in the original function. Consequently, this quantity will be squared and multiplied by 3, etc.
Expanding the square and simplifying the other terms, we get
Combining terms, we see that the x2, x and constant terms eliminate. This always happens when f(x) is a polynomial.
Now we divide by 
:
Finally we evaluate this ratio at x = 2:
