Question

If f (x)=3x, g(x)=x-3, and h(x)= square root of x, find (fogoh)(25)

Answer 1

(f o g o h)(x) = f { g [ h(x) ] }

Which means: apply first function h, then apply function g to the result, and finally apply  function f to the new result.

h(25) = √25 = 5

g(5) = 5  - 3 = 2

f(2) = 3(2) = 6.

Answer: 6