मराठी

Find ‘n’ if limx→2xn-2nx-2 = 80, x ∈ N - Mathematics

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प्रश्न

Find ‘n’ if `lim_(x -> 2) (x^n - 2^n)/(x - 2)` = 80, x ∈ N

बेरीज

उत्तर

Given that `lim_(x -> 2) (x^n - 2^n)/(x - 2)` = 80

= `n * (2)^(n - 1)` = 80   .....`[because lim_(x -> a) (x^n - a^n)/(x - a) = n * a^(n - 1)]`

= `n xx 2^(n - 1)`

= `5 xx (2)^(5 - 1)`

∴ n = 5

shaalaa.com
Derive Derivation of x^n
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 13: Limits and Derivatives - Exercise [पृष्ठ २४०]

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एनसीईआरटी एक्झांप्लर Mathematics [English] Class 11
पाठ 13 Limits and Derivatives
Exercise | Q 14 | पृष्ठ २४०
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