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mihalych1998 [28]
3 years ago
6

For f(x) = 5x and g(x)= x + 9, find

Mathematics
1 answer:
Bad White [126]3 years ago
5 0

Answer:

  • (fog)(x)  = 5x+45
  • (gof)(x)   = 5x+9
  • (fog)(3) = f(g(3)) = f(12) = 60    

Step-by-step explanation:

Given

  • f(x) = 5x
  • g(x) = x + 9

Finding (fog)(x)

(fog)(x)  = f(g(x))

(fog)(x)  = f(x+9)

(fog)(x)  = 5(x+9)             ∵ substitute x as x+9 in the f(x)

(fog)(x)  = 5x+45

Finding (gof)(x)

(gof)(x) = g(f(x))

(gof)(x)  = g(5x)

(gof)(x)   = 5x+9                 ∵ substitute x as 5x in the g(x)

Finding (fog)(3)

(fog)(3) = f(g(3))

substitute x = 3 in the g(x)=x+9

g(x) = x+9

g(3) = 3+9

g(3) = 12

so

(fog)(3) = f(g(3)) = f(12)

now substitute x = 12 in  f(x) = 5x

f(x) = 5x

f(12) = 5(12)

f(12) = 60

Thus,

(fog)(3) = f(g(3)) = f(12) = 60

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