Combinations of Functions
dl.uncw.edu › mat111hb › functionsNote that we could evaluate the function f + g at any number by evaluating f and g separately and adding the results, as we did above for 3. However, we generally simplify the formula for f + g by combining similar terms, then use this new formula to evaluate the sum function. (f + g)(x) = f(x) + g(x) = ( x 2 + 3x -7 ) + ( 4x +5) = x 2 + 7x - 2.