Evaluating

Functions can also be added or subtracted given a domain value. First evaluate each function for the given domain then perform the indicated operation using the output values.

Example If f(x) = 2x2 and g(x) = 3x2 + 1, what is f(2) + g(3) ?

Step 1. Evaluate each function

f(2) = 2(2)2 = 8

g(3) = 3(3)2 + 1 = 28

Step 2. Add the output values of the two functions

f (2) + g(3)

= 8 + 28

= 36