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Q.

Let f : R→[0, ∞) be such that limx→5 f(x) exists and limx→5 (f(x))2−9|x−5|=0. Then, limx→5 f(x) equals

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a

1

b

2

c

3

d

0

answer is C.

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Detailed Solution

limx→5 (f(x))2−9|x−5|=0⇒ limx→5 (f(x))2−9=0⇒   l2-9=0, where limx→5 f(x)=l⇒  l=±3⇒  l=3                                          [∴ f(x)≥0 for all x ∈ R]⇒  limx→5 f(x)=3
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