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नीचे दिए गए प्रश्न के लिए अनुच्छेद

A function f(x) is increasing where f ′(x) > 0 and decreasing where f ′(x) < 0, then at x = x1 function has its local minima. If f ′(x1) = 0 and f ′′(x1) > 0, similarly if at x = x2, f′(x2) = 0 and f ′′(x2) < 0, then at x = x2 function has its local maxima.

Given f(x) = x3 – 3x2 – 9x + 3; xR

Choose the correct answer

एक फलन f(x) वर्धमान है जहाँ f ′(x) > 0 एवं ह्रासमान है जहाँ f ′(x) < 0, तब x = x1 पर फलन का स्थानीय निम्निष्ठ है। यदि f ′(x1) = 0 तथा f ′′(x1) > 0, इसी प्रकार यदि x = x2 पर, f′(x2) = 0 तथा f ′′(x2) < 0 है, तब x = x2 पर फलन का स्थानीय उच्चिष्ठ है।

दिया है f(x) = x3 – 3x2 – 9x + 3; xR

सही उत्तर का चयन कीजिए।

Q. f(x) is decreasing in interval

प्रश्न - f(x) कौनसे अंतराल में ह्रासमान है

A
(–∞, –1)
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B
(3, ∞)
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C
(–1, 3)
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D
(–∞, –1) ∪ (3, ∞)
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Solution

The correct option is C (–1, 3)
Solution

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