TS EAMCET · Maths · Continuity and Differentiability

Let $f (x) = \{\begin{matrix} 3 - x & if & x < - 3 \\ 6 & if & - 3 \leq x \leq 3 \\ 3 + x & if & x > 3 \end{matrix}$ . Let $α$ be the number of points of discontinuity of $f$ and $β$ be the number of points where $f$ is not differentiable. Then $α + β =$

A $6$
B $3$
C $2$
D $0$

Verified Solution

Answer & Solution

Correct Answer

(C) $2$

Step-by-step Solution

Detailed explanation

The function is continuous everywhere, so number of points of discontinuity is α=0. The function is not differentiable at x=±3, so number of points of non-differentiability is β=2. Hence, α+β=2

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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Step-by-step Solution

Let $f (x) = \{\begin{matrix} 3 - x & if & x < - 3 \\ 6 & if & - 3 \leq x \leq 3 \\ 3 + x & if & x > 3 \end{matrix}$ . Let $α$ be the number of points of discontinuity of $f$ and $β$ be the number of points where $f$ is not differentiable. Then $α + β =$