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Evaluate the following limits: if limx→1[x4-1x-1]=limx→a[x3-a3x-a], find all the value of a.

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प्रश्न

Evaluate the following limits: if `lim_(x -> 1)[(x^4 - 1)/(x - 1)] = lim_(x -> "a") [(x^3 - "a"^3)/(x - "a")]`, find all the value of a.

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उत्तर

`lim_(x -> 1)[(x^4 - 1)/(x - 1)] =  lim_(x -> "a") [(x^3 - "a"^3)/(x - "a")]`

`lim_(x -> 1) (x^4 - (1)^4)/(x - 1) =  lim_(x -> "a") (x^3 - "a"^3)/(x - "a")`

∴ `4(1)^3 = 3"a"^2        ...[because lim_(x -> "a") (x^"n" - "a"^"n")/(x - "a") = "na"^("n" - 1)]`

∴ 3a2 = 4

∴ a2 = `4/3`

∴ a = `± 2/sqrt(3)`

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अध्याय 7: Limits - EXERCISE 7.1 [पृष्ठ १००]

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बालभारती Mathematics and Statistics (Commerce) Part 1 [English] Standard 11 Maharashtra State Board
अध्याय 7 Limits
EXERCISE 7.1 | Q I. 4. | पृष्ठ १००

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