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If limx→2xn-2x-2 = 80 then find the value of n.

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प्रश्न

if `lim_(x -> 2) (x^"n"- 2^"n")/(x - 2)` = 80 then find the value of n.

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उत्तर

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

∴ n(2)n–1 = 80       ...`[lim_(x -> "a") (x^"n" - "a"^"n")/(x - "a") = "na"^("n" - 1)]`

∴ n(2)n–1 = 5 x 16
= 5 x (2)4
∴ n(2)n –1 = 5 x (2)5–1
∴ n = 5

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अध्याय 7: Limits - MISCELLANEOUS EXERCISE - 7 [पृष्ठ १०५]

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बालभारती Mathematics and Statistics (Commerce) Part 1 [English] Standard 11 Maharashtra State Board
अध्याय 7 Limits
MISCELLANEOUS EXERCISE - 7 | Q I. | पृष्ठ १०५

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