English

Lim X → a ( X + 2 ) 5 / 2 − ( a + 2 ) 5 / 2 X − a

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Question

\[\lim_{x \to a} \frac{\left( x + 2 \right)^{5/2} - \left( a + 2 \right)^{5/2}}{x - a}\] 

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Solution

\[\lim_{x \to a} \left[ \frac{\left( x + 2 \right)^\frac{5}{2} - \left( a + 2 \right)^\frac{5}{2}}{x - a} \right]\]
\[ = \lim_{x \to a} \left[ \frac{\left( x + 2 \right)^\frac{5}{2} - \left( a + 2 \right)^\frac{5}{2}}{\left( x + 2 \right) - \left( a + 2 \right)} \right]\]

Let y = x + 2 and a + 2.

When x → a, then x + 2 ​→ a + 2.
 y ​→ 

\[\lim_{y \to b} \left[ \frac{y^\frac{5}{2} - b^\frac{5}{2}}{y - b} \right]\]
\[ = \frac{5}{2} \left( b \right)^\frac{5}{2} - 1 \]
\[ = \frac{5}{2} b^\frac{3}{2} \]
\[ = \frac{5}{2} \left( a + 2 \right)^\frac{3}{2}\] 

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Chapter 29: Limits - Exercise 29.5 [Page 33]

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R.D. Sharma Mathematics [English] Class 11
Chapter 29 Limits
Exercise 29.5 | Q 1 | Page 33

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