LimitsHard

Question

Let f(x) = , if f(x) exists, then value of a is : 

Options

A.1
B.-1
C.2
D.-2

Solution

f(x) =
L.H.L. =
R.H.L. = a (1 + h) = a
L.H.L.=  R.H.L.
⇒ 1 + = a
⇒  a2 - a - 2 = 0
⇒  (a - 2) (a + 1) = 0
⇒  a = 2, - 1

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