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

यदि वक्र \(y ( x )=\int_{0}^{ x }\left(2 t ^{2}-15 t +10\right) dt\) के बिंदु \(( a , b )\), \(a>1\), पर अभिलम्ब, रेखा \(x +3 y =-5\) के समान्तर है, तो \(| a +6 b |\) का मान बराबर है ........ |

  1. A \(324\)
  2. B \(406\)
  3. C \(512\)
  4. D \(376\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(406\)

Step-by-step Solution

Detailed explanation

\(y(x)=\int_{0}^{x}\left(2 t^{2}-15 t+10\right) d t\) \(\left.y^{\prime}(x)\right]_{x=a}=\left[2 x^{2}-15 x+10\right]_{a}=2 a^{2}-15 a+10\) Slope of normal \(=-\frac{1}{3}\) \(\Rightarrow \quad 2 a^{2}-15 a+10=3 \Rightarrow a=7\) \(a=\frac{1}{2}(\) rejected \()\)…
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