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JEE Mains · Maths · STD 12 - 6. Application of derivatives

वक्र \(y ( x )= ax ^3+ bx ^2+ cx +5, x\)-अक्ष को बिंदु \(P (-2,0)\) पर स्पर्श करता है तथा \(y\)-अक्ष को बिंदु \(Q\) पर काटता है, जहाँ \(Q\) पर \(y ^{\prime}\) का मान \(3\) है। तो \(y ( x )\) का स्थानीय उच्चतम मान है:

  1. A \(\frac{27}{4}\)
  2. B \(\frac{29}{4}\)
  3. C \(\frac{37}{4}\)
  4. D \(\frac{9}{2}\)
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Answer & Solution

Correct Answer

(A) \(\frac{27}{4}\)

Step-by-step Solution

Detailed explanation

\(y(x)=a x^{3}+b x^{2}+c x+5\) is passing through \((-2,0)\) then \(8 a-4 b+2 c=5 \ldots \ldots(1)\) \(y^{\prime}(x)=3 a x^{2}+2 b x+c\) touches \(x\)-axis at \((-2,0)\) \(12 a-4 b+c=0\) again, for \(x=0, y^{\prime}(x)=3\) \(c=3\) Solving eq. \((1), (2)\) and \((3)\)…
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