AP EAMCET · Maths · Continuity and Differentiability

The function \(f(x)=|x-24|\) is

A differentiable at \([0,25]\)
B not continuous at \(x=24\)
C neither continuous nor differentiable on [0,25].
D continuous on \([0,25]\), but not differentiable on \([0,25]\).

Verified Solution

Answer & Solution

Correct Answer

(D) continuous on \([0,25]\), but not differentiable on \([0,25]\).

Step-by-step Solution

Detailed explanation

\(\begin{gathered}f(x)=|x-24|=\left\{\begin{array}{cc}-x+24, & x \lt 24 \\ x-24, & x \geq 24\end{array}\right. \\ \lim _{x \rightarrow 24^{-}} f(x)=\lim _{x \rightarrow 24}(-x+24)=0\end{gathered}\)…

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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