Question

Please help step by step, I have no idea how to do this and I have 3 more of them to do :'( Thank you in advance

Answer 1

given:

f(x) = 2^x-4

g(x) = 5/x

to find g(f(2))

firstly, lets find f(2) by substiting 2 for x in f(x)

f(2) = 2^2-4

= 2 ^-2

= 1/2^2 = 1/4

so, substituting 1/4 for x in g(x) to get g(f(2))

g(f(2)) = 5/1/4

= 5 divide by 1/4

= 5 X 4

= 20

Therefore g(f(2)) = 20