Functions Question 235

Question: If $ f(x)=2x $ and g is identity function, then

Options:

A) $ (fog)(x)=g(x) $

B) $ (g+g)(x)=g(x) $

C) $ (fog)(x)=(g+g)(x) $

D) None of these

Show Answer

Answer:

Correct Answer: C

Solution:

$ (fog)x=2[g(x)] $ and $ (g+g),x=2,[g(x)]. $