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Evaluate: limx→a(2+x)52-(a+2)52x-a - Mathematics

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प्रश्न

Evaluate: `lim_(x -> a) ((2 + x)^(5/2) - (a + 2)^(5/2))/(x - a)`

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उत्तर

Given that `lim_(x -> a) ((2 + x)^(5/2) - (a + 2)^(5/2))/(x - a)`

= `lim_(x -> a) ((2 + x)^(5/2) - (a + 2)^(5/2))/((2 + x) - (a + 2))`

= `lim_(2 + x -> a + 2) ((2 + x)^(5/2) - (a + 2)^(5/2))/((2 + x) - (a + 2))`

= `5/2 (a + 2)^(5/(2 - 1))`

= `5/2(a + 2)^(3/2)`   ....`[because lim_(x -> a) (x^n - a^n)/(x - a) = n * a^(n - 1)]`

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अध्याय 13: Limits and Derivatives - Exercise [पृष्ठ २३९]

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एनसीईआरटी एक्झांप्लर Mathematics [English] Class 11
अध्याय 13 Limits and Derivatives
Exercise | Q 6 | पृष्ठ २३९

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