NCERT Class 12 · Ch 5 Exercise 5.1 · Q27
NCERT Class 12 Maths · Chapter 5 Continuity And Differentiability · Exercise 5.1 Question 27
Find k for f(x)=kx² for x≤2 and 3 for x>2, continuous at 2.
💡 Concept Hints
- Identify the domain and the inner and outer functions, or the relevant one-sided limits.
- Apply the appropriate differentiation or limit rule, keep all chain factors, and check exceptional points.
✅ Step-by-Step Solution
Final Answer: k=3/4.
- The left limit and f(2) are 4k, the right limit is 3.
- Thus 4k=3 and k=3/4.
Master Chapter 5: Continuity And Differentiability
Practise interactive questions, flashcards, visual mind maps, and timed board tests for Continuity And Differentiability.
← Previous Question
Find k for f(x)=k cos x/(π−2x) for x≠π/2 and 3 at π/2, continuous at…
Next Question →Find k for f(x)=kx+1 for x≤π and cos x for x>π, continuous at π.
All Questions in Continuity And Differentiability — Exercise 5.1
Related Questions in Continuity And Differentiability
Class 12 Continuity And Differentiability · Mcq Single Correct
For k<0, define f(x)=(1−cos(kx))/(x sin x) for nonzero x near 0, and f(0)=1/2. Find k for…
Class 12 Continuity And Differentiability · Mcq Single Correct
Near π/2, f(x)=k cos x/(π−2x) for x≠π/2 and f(π/2)=3. Find k for continuity.
Class 12 Continuity And Differentiability · Mcq Single Correct
Find the full set of real inputs excluded from the natural domain of cot x (its poles).
Class 12 Continuity And Differentiability · Mcq Single Correct
How many real inputs are excluded from the original formula f(x)=(x−1)/[x(x²−1)]?
Class 12 Continuity And Differentiability · Mcq Single Correct
For x≠0, f(x)=(e^(3x)−e^(−5x))/x, and f(0)=k. Find k for continuity at 0.
Class 12 Continuity And Differentiability · Mcq Single Correct
Let f(x)=x/|x| for x<0 and f(x)=−1 for x≥0. What is its complete continuity set?