If f(x) = 2x and g is identity function, then - Vidyadip

MCQ

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

A
$(fog)(x) = g(x)$
B
$(g + g)(x) = g(x)$
✓
$(fog)(x) = (g + g)(x)$
D
None of these

✓

Answer

Correct option: C.

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

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

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