Posted by **Julie** on Sunday, February 10, 2013 at 10:35pm.

The application of one function followed by the application of a second function to the result of the first as in F^-1(f(x)) is called composition of functions. The two functions need not be inverse of each other. In a diagram, the output of one function is f(x) is used as the input for a second function g(x). In this case, the composite is denoted g(f(x)) which is read "g composed with f of x" or "g of f of x."

**If you could help with anything I'd really appreciate it!! Thank you**

Suppose f and g are functions defined by the following table:

x) -3 -2 -1 0 1 2 3

f(x) 10 8 7 3 -4 -7 -8

g(x) 3 1 0 2 -3 -1 -2

i. Make a table of values for f(g(x)) with x= -3,-2,-1,0,1,2,3 Remember to always start with the innermost set of parentheses

ii. Make a table of values for g(g(x)) with x= -3,-2,-1,0,1,2,3.

iii. Explain why you cannot find the composite function g(f(x)).

a)Consider the two functions f(x)=-x^2+ 7 and g(x)=3x+4. Using input values of -1,2,0.5,and 8 for x:

1. Calculate f(g(x)) for each input value

2. Calculate g(f(x)) for each input value.

B) if f and g are two functions, what must be true about the domains and ranges of f and g in order for f(g(x)) to make sense? What must be true for g(f(x))to make sense?

- Precalculus -
**Katy**, Thursday, February 12, 2015 at 8:22pm
If (f º g)(3) = 7, then f(x) and g(x) could be:

Select one:

a. f(x) = 3x2 – 10x + 4, g(x) = x + 2

b. f(x) = 2x – 3, g(x) = x2 – 4

c. f(x) = 3x + 1, g(x) = x – 3

d. f(x) = x2, g(x) = x – 2

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