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JEE Main 202431 JanuaryMorning Shift
Exam
JEE Main
Year
2024
Date
31 January
Shift
Morning Shift
Subject
Mathematics
Chapter
Definite Integration

JEE Main 2024 · 31 January · Morning Shift · Mathematics · Definite Integration

Let S = (- 1, ∞) and f: S → ℝ be defined as f(x) = ∫ _ - 1 ^ x ( e...

Let S=(−1,∞)S = \left(- 1, \infty\right) and f:S→Rf: S \to \mathbb{R} be defined as f(x)=∫−1x(et−1)11(2t−1)5(t−2)7(t−3)12(2t−10)61dtf\left(x\right) = \mathop{∫}_{- 1}^{x}{\left({e}^{t} - 1\right)}^{11}{\left(2t - 1\right)}^{5}{\left(t - 2\right)}^{7}{\left(t - 3\right)}^{12}{\left(2t - 10\right)}^{61}dt. Let p=p = Sum of square of the values of xx, where f(x)f\left(x\right) attains local maxima on SS. and q=q =Sum of the values of xx, where f(x)f\left(x\right) attains local minima on SS. Then, the value of p2+2q{p}^{2} + 2q is ________Let S = (- 1, ∞) and f: S → ℝ be defined as f(x) = ∫ _ - 1 ^ x ( e ^ t - 1) ^ 11 (2t - 1) ^ 5 (t - 2) ^ 7 (t - 3) ^ 12

Correct answer

0

Step-by-step solution

Given,

f(x)=∫−1x(et−1)11(2t−1)5(t−2)7(t−3)12(2t−10)61dtf\left(x\right) = \mathop{∫}_{- 1}^{x}{\left({e}^{t} - 1\right)}^{11}{\left(2t - 1\right)}^{5}{\left(t - 2\right)}^{7}{\left(t - 3\right)}^{12}{\left(2t - 10\right)}^{61}dt

Now, differentiating the above integral using Newton Leibnitz's theorem, we get,

f′(x)=(ex−1)11(2x−1)5(x−2)7(x−3)12(2x−10)61{f}^{'}\left(x\right) = {\left({e}^{x} - 1\right)}^{11}{\left(2x - 1\right)}^{5}{\left(x - 2\right)}^{7}{\left(x - 3\right)}^{12}{\left(2x - 10\right)}^{61}

Let S = (- 1, ∞) and f: S → ℝ be defined as f(x) = ∫ _ - 1 ^ x ( e ^ t - 1) ^ 11 (2t - 1) ^ 5 (t - 2) ^ 7 (t - 3) ^ 12

Now, from the above diagram using first derivative test we get,

Local minima at x=12,x=5x = \dfrac{1}{2}, x = 5 

Local maxima at x=0,x=2x = 0, x = 2

So, p=0+4=4,q=12+5=112p = 0 + 4 = 4, q = \dfrac{1}{2} + 5 = \dfrac{11}{2}

Hence, p2+2q=16+11=27{p}^{2} + 2q = 16 + 11 = 27

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