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Which of the following statements are TRUE?

A. ∫491x dx=2\displaystyle\int_4^9 \dfrac{1}{\sqrt{x}}\, dx = 2

B. ∫−44(x101+x201+x301) dx=4(1102+1202+1302)\displaystyle\int_{-4}^4 (x^{101} + x^{201} + x^{301})\, dx = 4\left(\dfrac{1}{102} + \dfrac{1}{202} + \dfrac{1}{302}\right)

C. ∫−11x1012 dx=21013\displaystyle\int_{-1}^1 x^{1012}\, dx = \dfrac{2}{1013}

D. ∫(x2+2x+1) dx=(x+1)33+c\displaystyle\int (x^2 + 2x + 1)\, dx = \dfrac{(x+1)^3}{3} + c where cc is an arbitrary constant

Choose the correct answer from the options given below:

Solution

✅ Correct Option: 1

A: ∫49x−1/2dx=2x\int_4^9 x^{-1/2}dx=2\sqrt{x} evaluated from 44 to 99 equals 6−4=26-4=2, true. B: the integrand is odd over a symmetric interval, so the value is 00, not the stated positive sum, false. C: ∫−11x1012dx=21013\int_{-1}^1 x^{1012}dx=\frac{2}{1013}, true. D: x2+2x+1=(x+1)2x^2+2x+1=(x+1)^2, whose integral is (x+1)33+c\frac{(x+1)^3}{3}+c, true.

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