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Mathematics · JEE | APPLICATION OF DERIVATIVES

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माना \( f(x) = x^3 - 6x^2 + 9x + 15 \)। इस फलन के लिए स्थानीय निम्निष्ठ (local minima) का बिंदु है:

  1. A
    \( x = 3 \)
  2. B
    \( x = 1 \)
  3. C
    \( x = 0 \)
  4. D
    \( x = -1 \)
उत्तर और समाधान देखें

सही उत्तर · विकल्प A

\( x = 3 \)

व्याख्या

Derivative \( f'(x) = 3x^2 - 12x + 9 = 3(x-1)(x-3) = 0 \Rightarrow x = 1, 3 \). Second derivative \( f''(x) = 6x - 12 \). At \( x = 3 \), \( f''(3) = 6 > 0 \), hence it is a point of local minima.
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