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Find limx→0 f(x), where f(x)={x|x|x≠00x=0

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Question

Find `lim_(x -> 0)` f(x), where `f(x) = {(x/|x|, x != 0),(0, x = 0):}`

Sum
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Solution

If x < 0, |x| = −x

∴ `lim_(x → 0^-) f(x) = lim_(x → 0^-) (x/|x|) = lim_(x → 0^-)(-x)/x = -1`

And if x > 0, |x| = x

∴ `lim_(x → 0^+) f(x) = lim_(x → 0^+) (x/|x|) = lim_(x → 0^+) x/x = 1`

∴ `lim_(x → 0^-) f(x) ≠ lim_(x → 0^+) f(x)`

Hence, the equation does not exist at x = 0.

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Chapter 12: Limits and Derivatives - EXERCISE 12.1 [Page 238]

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NCERT Mathematics [English] Class 11
Chapter 12 Limits and Derivatives
EXERCISE 12.1 | Q 26. | Page 238

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