CUET · MATHS · PYQ PAPER 2025
Which of the following statements are true?
(A) The function \(f(x)=\frac{x^4}{4}-\frac{4}{3} x^3+\frac{x^2}{2}+6 x\) has 3 critical points.
(B) The function \(f(x)=|x|+3\) has no minimum value.
(C) A local maximum value is always the absolute maximum value.
(D) \(f(x)=x^2\) has minima at \(x=0\).
Choose the correct answer from the options given below :
- A (A) and (B) only
- B (B) and (C) only
- C (A) and (D) only
- D (A), (B) and (C) only
Answer & Solution
Correct Answer
(C) (A) and (D) only
Step-by-step Solution
Detailed explanation
\(f'(x) = \frac{d}{dx}\left(\frac{x^4}{4}-\frac{4}{3} x^3+\frac{x^2}{2}+6 x\right) = x^3 - 4x^2 + x + 6\) \(x^3 - 4x^2 + x + 6 = 0 \Rightarrow (x+1)(x-2)(x-3) = 0\) Critical points: \(x = -1, 2, 3\). (A) is TRUE. \(f(x)=|x|+3\). Minimum value is \(|0|+3=3\) at \(x=0\). (B) is…
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