EVALUATING COMPOSITION OF FUNCTIONS FROM TABLE WORKSHEET

Problem 1 :

Use the table of values to evaluate each expression

evaluatingcompofunfromtableq1

1)  f ( g(8) )

4)  g ( f (3) )

7)  g ( g (2) )

2)  f( g(5) )

5)  f ( f (4) )

8)  g ( g (6) )

3)  g ( f (5) )

6)  f ( f (1) )

9)  g ( g (1) )

Solution

Problem 2 :

Evaluating Composite Functions :

The tables give some selected ordered pairs for functions f and g

evaluatingcompofunfromtableq2.png

1) (f ∘ g)(2)

2) (f ∘ g)(1)

3) (f ∘ g)(9)

4) (f ∘ g)(5)

5) (g ∘ f)(6)

6) (f ∘ g)(7)

7) (g ∘ f)(12)

8) (g ∘ f)(3)

Solution

Problem 3 :

Use the tables of ordered pairs to determine the value of each composite function

evaluatingcompofunfromtableq3.png

1) (𝑓 ∘ 𝑔)(36) =

2)  (𝑔 ∘ 𝑔)(16) =

3) (𝑔 ∘ 𝑓)(4) =

4)  (𝑓 ∘ 𝑓)(4) =

Solution

Problem 4 :

The table below shows values of 𝑓(𝑥) at selected values of 𝑥. The function 𝑔(𝑥) is shown in the graph below.

evaluatingcompofunfromtableq4.png

Let h be the function defined by ℎ(𝑥) = 2|𝑥 − 4|.

Find: 

1. 𝑦 = ℎ(𝑓(2))

2. 𝑦 = ℎ(𝑔(3))

3. 𝑦 = 𝑔(𝑓(−2))

4. 𝑦 = 𝑓(𝑔(−3))

5. 𝑦 = 𝑔(𝑓(ℎ(3)))

6. Find ℎ(𝑓(𝑔(0)))

Solution

Use the values in the table to evaluate the indicated composition of functions.

Problem 5 :

compositionfromtableq1

(i)  (f ∘ g) (1)

(ii)  (g ∘ f) (2)

(iii)  (g ∘ g) (1)

(iv)  (f ∘ g) (2)

(v)  (g ∘ f) (3)

(vi)  (f ∘ f) (3)

Solution

Problem 6 :

compositionfromtableq2.png

(i)  f(13)

(ii)  f(6)

(iii)  g(15)

(iv)  g(13)

(v)  For what value of x, f(x) = 35 ?

(vi)  For what value of x, g(x) = 5 ?

Solution

Problem 7 :

compositionfromtableq3

(i)  f(4) = 

(ii)  g(1) = 

(iii)  g(4) =

(iv)  g(-6) = 

(v) For what value of x, f(x) is -24 ?

(vi) For what value of x, f(x) is 4 ?

Solution

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