If fx = xfor≤00for>0 then f(x) at x=0 is

(B) Not continuous but differentiable

(C) Continuous and differentiable

(D) Not continuous and not differentiable

MHT CET · Maths · Continuity and Differentiability

If $f (x) = \{\begin{matrix} x & f o r & \leq 0 \\ 0 & f o r & > 0 \end{matrix}$ then $f (x)$ at $x = 0$ is

A Continuous but not differentiable
B Not continuous but differentiable
C Continuous and differentiable
D Not continuous and not differentiable

Verified Solution

Answer & Solution

Correct Answer

(A) Continuous but not differentiable

Step-by-step Solution

Detailed explanation

Continuity at

x = 0

\lim_{x \to 0^{-}} f (x) = \lim_{x \to 0} x = 0

\lim_{x \to 0^{+}} f (x) = 0

f (0) = 0

∴ c o n t i n u o u s a t x = 0

For differentiability

f' (0^{+}) = 0

f' (0^{-}) = 1

∴

Not differentiable
Alternative
Diagram:

It has sharp edge at

x = 0

∴

not differentiable but continuous

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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