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NDA 2025
Exam
NDA
Year
2025
Subject
Mathematics
Chapter
Area Under Curves

NDA 2025 · Mathematics · Area Under Curves

For the following three (03) items: Consider the function f(x) =...

For the following three (03) items:
Consider the function f(x)=x∣x∣f(x) = x|x|.

What is the area bounded by the curve f(x)f(x), the xx-axis and the lines x=−2x = -2 and x=1x = 1?

Options

  1. A13\dfrac{1}{3}
  2. B23\dfrac{2}{3}
  3. C52\dfrac{5}{2}
  4. D33

Correct answer

D. 33

Step-by-step solution

The given function is f(x)=x∣x∣f(x) = x|x|.

The required area bounded by the curve f(x)f(x), the xx-axis and the lines x=−2x = -2 and x=1x = 1 is given by:

A=∫−21∣f(x)∣dxA = \int_{-2}^{1} |f(x)| dx

A=∫−21∣x∣x∣∣dxA = \int_{-2}^{1} |x|x|| dx

Since ∣x∣x∣∣=∣x∣2=x2|x|x|| = |x|^2 = x^2, we have:

A=∫−21x2dxA = \int_{-2}^{1} x^2 dx

A=A =\left[ \dfrac{x^3}{3} \right]_{-2}^{1}<br><br><br><br>A = \dfrac{1^3}{3} - \dfrac{(-2)^3}{3}<br><br><br><br>A = \dfrac{1}{3} - \left( -\dfrac{8}{3} \right)

A=A =\dfrac{9}{3} =3<br><br>Answer:<br><br>Answer:3
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