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Evaluate the following limits: if limx→5[xk-5kx-5] = 500, find all possible values of k.

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प्रश्न

Evaluate the following limits: if `lim_(x -> 5)[(x^"k" - 5^"k")/(x - 5)]` = 500, find all possible values of k.

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उत्तर

`lim_(x -> 5)[(x^"k" - 5^"k")/(x - 5)]` = 500

∴ `"k"(5)^("k" - 1) = 500      ...[because lim_(x -> "a") (x^"n" - "a"^"n")/(x - "a")] = "na"^("n" - 1)]`

∴ k(5)k–1 = 4 x 125
∴ k(5)k–1 = 4 x (5)3
∴ k(5)k–1 = 4 x (5)4–1
Comparing both sides, we get
k = 4

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पाठ 7: Limits - EXERCISE 7.1 [पृष्ठ १००]

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