If f(x) = 2x + 3 and g(x) = x2 − 1, find the values of combining these functions. match each combined function to its corresponding value.
tiles: 1) (f + g)(2)
2) (f − g)(4)
3) (f ÷ g)(2) (f × g)(1)
pairs a) -4
b) 10
c) 0

We determine the answers to these items by substituting the values before performing the operation.

1) (f + g)(2) 
                f(2) = 2(2) + 3 = 7
                g(2) = 2² - 1 = 3
    (f + g)(2) = 7 + 3 = 10  (Answer for 1 is B)

2) (f - g)(4) 
               f(4) = 2(4) + 3 = 11
               g(4) = 4² - 1 = 15
     (f - g)(4) = 11 - 15 = -4   (Answer for 2 is A)

3) (f ÷ g)(2) (f x g)(1)
We already have the values of f(2) and g(2) above (in number 1)
              f(1) = 2(1) + 3 = 5
             g(1) = 1² - 1 = 0
   The answer to this item is zero because any number multiplied to zero is zero. Letter C.