CUET · MATHS · PYQ PAPER 2025

The function \(f(x)=x+\frac{1}{x}\) has

A local maxima at \(x=-1\)
B local minima at \(x=-1\)
C local maxima at \(x=1\).
D neither local maxima nor local minima

Verified Solution

Answer & Solution

Correct Answer

(A) local maxima at \(x=-1\)

Step-by-step Solution

Detailed explanation

\(f'(x) = 1 - \frac{1}{x^2}\) \(f'(x) = 0 \implies 1 - \frac{1}{x^2} = 0 \implies x^2 = 1 \implies x = \pm 1\) \(f''(x) = \frac{2}{x^3}\) \(f''(-1) = \frac{2}{(-1)^3} = -2 Local maxima at \(x=-1\)

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.

Same subject

Match List - I with List - II.

LIST - I	LIST - II
(A) \(x^x\) has a stationary point at \(x\) equal to	(I) \(e\)
(B) For \(x>0\), minimum value of \(x^x\)	(II) \(1 / e\)
(C) The greatest value of \(\left(\frac{1}{x}\right)^x\)	(III) \(e^{1 / e}\)
(D) The stationary point of \(\frac{\log x}{x}\) for \(x\), where \(x>0\), is	(IV) \(e^{-1 / e}\)

Choose the correct answer from the otions given below:

CUET 2023 Medium

Match List - I with List - II.

List - I	List - II
(A) If A and B are mutually exclusive events, then \(P ( A \cup B )=\)	(I) \(\frac{ P ( A \cap B )}{ P ( B )}, P ( B ) \neq 0\)
(B) If A and B are independent events, then \(P ( A \cap B )=\)	(II) \(\frac{ P ( A \cap B )}{ P ( A )}, P ( A ) \neq 0\)
(C) If A and B are two events of a sample space of an experiment, then \(P ( A / B )=\)	(III) \(P ( A ) \cdot P ( B )\)
(D) If A and B are two events of a sample space of an experiment, then \(P ( B / A )=\)	(IV) \(P ( A )+ P ( B )\)

Choose the correct answer from the options given below :

CUET 2023 Easy

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