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Vadim26 [7]
3 years ago
12

Let f(x)= 5x-9 and g(x)=x+4 find f(g(x) and g (f(x)

Mathematics
1 answer:
shtirl [24]3 years ago
8 0
F(g(x)= x+4
f(x+4)= 5(x+4)-9
=5x+20-9
=5x+11
g(f(x)= 5x-9
g(5x-9)=5x-9+4
=5x-5
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2. \( g\circ f(x)=0.05x-3000

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Explanation:

1. The composition of the function

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means that you first apply the function g(x) and then f(x) on the output of g(x).

That is:

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  • g(x) = x - 3000

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       f(g(x))=0.05x-150

2. The composition of the function

                                                             \( g\circ f(x)=g(f(x)) \)                                                                  

means that you first apply the function f(x) and then g(x) on the output of f(x).

That is:

      g(f(x))=((0.05x)-3000)=0.05x-3000

3. Which one represents Dale's commission

To calculate Dales's commision you must subtract $3,000 from the sales, to find the sales over $3000. That is: x - 3,000, which is the function g(x).

Therefore, you first use g(x).

Then, you must multiply the output of g(x) by 0.05 to find the 5% of the sales over $3,000. That is: 0.05(g((x)) = 0.05(x - 3000) = 0.05x - 150.

Therefore, the composition that represents Dale's commission is the first one:

  f(g(x)=0.05(x - 3000)

       f(g(x))=0.05x-150

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