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If the function f(x) satisfies limx→1f(x)-2x2-1=π, evaluate limx→1f(x).

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Question

If the function f(x) satisfies `lim_(x -> 1) (f(x) - 2)/(x^2 - 1) = pi`, evaluate `lim_(x -> 1) f(x)`.

Sum
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Solution

`lim_(x → 1) (f(x) - 2)/(x^2 - 1)` = π

⇒ `(lim_(x → 1) (f(x) - 2))/(lim_(x → 1)(x^2 - 1)` = π

⇒ `lim_(x → 1) (f(x) - 2) = π lim_(x → 1)(x^2 - 1)`

⇒ `lim_(x → 1) (f(x) - 2) = π (1^2 - 1)`

⇒ `lim_(x → 1) (f(x) - 2) = 0`

⇒ `lim_(x → 1) f(x) - lim_(x → 1) 2 = 0`

⇒ `lim_(x → 1) f(x) - 2 = 0`

∴ `lim_(x → 1) f(x) = 2`

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Chapter 12: Limits and Derivatives - EXERCISE 12.1 [Page 239]

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NCERT Mathematics [English] Class 11
Chapter 12 Limits and Derivatives
EXERCISE 12.1 | Q 31. | Page 239

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