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If F is an Integrable Function, Show that (Ii) a ∫ − a X F ( X 2 ) D X = 0

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Question

If f is an integrable function, show that

\[\int\limits_{- a}^a x f\left( x^2 \right) dx = 0\]

 

Sum
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Solution

\[I = \int_{- a}^a xf\left( x^2 \right) d x\]
\[Let\ g\left( x \right) = xf\left( x^2 \right)\]
\[ \Rightarrow g\left( - x \right) = \left( - x \right)f \left( - x \right)^2 = - \left( x \right)f\left( x^2 \right) = - g\left( x \right) i . e, g\left( x \right) \text{ is odd }\]
Therefore
\[I = 0 ...............\left[\text{Using }\int_{- a}^a g\left( x \right) d x\ = 0\text{ when g(x) is odd}\right]\]

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Chapter 19: Definite Integrals - Exercise 20.5 [Page 96]

APPEARS IN

R.D. Sharma Mathematics Volume 1 and 2 [English] Class 12
Chapter 19 Definite Integrals
Exercise 20.5 | Q 45.2 | Page 96

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