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JEE Mains · Maths · STD 12 - 5. continuity and differentiation

माना \(f: \mathbf{R} \rightarrow \mathbf{R}\) घात चार का एक बहुपद फलन है जिसके चरम मान \(x=4\) और \(x=5\) पर हैं।
यदि \(\lim _{x \rightarrow 0} \frac{f(x)}{x^2}=5\) है, तो \(f(2)\) = ___

  1. A 12
  2. B 10
  3. C 8
  4. D 14
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Answer & Solution

Correct Answer

(B) 10

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Detailed explanation

\begin{aligned} & \lim _{x \rightarrow 0} \frac{f(x)}{x^2}=5 \\ & \lim _{x \rightarrow 0} \frac{\left.a x^4+b x^3+c x^2+d x+e\right)}{x^2}=5 \\ & c=5 \text { and } d=e=0 \\ & f(x)=a x^4+b x^3+5 x^2 \\ & f^{\prime}(x)=4 a x^3+3 b x^2+10 x \\ & =x\left(4 a x^2+3 b x+10\right)…

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