If f(x) = x + 2, then f'(f(x)) at x = 4 is - Vidyadip

MCQ

If $f(x) = x + 2,$ then $f'(f(x))$ at $x = 4$ is

A
$8$
✓
$1$
C
$4$
D
$5$

✓

Answer

Correct option: B.

$1$

b
(b) $f(x) = x + 2$ ==> $f'(x) = 1$

$\therefore$ $f'(f(x)) = f'(x + 2) = 1$ at $x = 4$.

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