A function f(x) , = * 20 c 1 + x, & x 2 5 - x, & x > 2 . , is - Vidyadip

MCQ

A function $f(x)\, = \left\{ {\begin{array}{*{20}{c}}{1 + x,}&{x \le 2}\\{5 - x,}&{x > 2}\end{array}} \right.\,$ is

A
Not continuous at $x = 2$
B
Differentiable at $x = 2$
✓
Continuous but not differentiable at $x = 2$
D
None of these

✓

Answer

Correct option: C.

Continuous but not differentiable at $x = 2$

c
(c) $\mathop {\lim }\limits_{h \to {0^ - }} 1 + (2 - h) = 3$,

$\mathop {\lim }\limits_{h \to {0^ + }} 5 - (2 + h) = 3$, $f(2) = 3$

Hence, $f$ is continuous at $x = 2$

Now $Rf'(x) = \mathop {\lim }\limits_{h \to 0} \frac{{5 - (2 + h) - 3}}{h} = - 1$

$Lf'(x) = \mathop {\lim }\limits_{h \to 0} \frac{{1 + (2 - h) - 3}}{{ - h}} = 1$

$\because Rf'(x) \ne Lf'(x)$; $f$ is not differentiable at $x = 2$.

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