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CUET · MATHS · PYQ PAPER 2023

If the function \(f(x)=x^4-62 x^2+a x+9\) attains its local maximum value at \(x=1\), then \(a\) is equal to :

  1. A 120
  2. B 110
  3. C 100
  4. D 90
Verified Solution

Answer & Solution

Correct Answer

(A) 120

Step-by-step Solution

Detailed explanation

\(f'(x) = 4x^3 - 124x + a\) \(f'(1) = 4(1)^3 - 124(1) + a = 0\) \(4 - 124 + a = 0\) \(-120 + a = 0\) \(a = 120\)
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