Q.

The true solution set of inequality log(x+1)⁡x2−4>1=

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a

(2,∞)

b

2,1+212

c

1−212,1+212

d

1+212,∞

answer is D.

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Detailed Solution

log(x+1)⁡x2−4>1we have x2−4>0,x+1>0 and x+1≠1∴ x∈(2,∞)-----iCase I:     x+1>1⇒x>0∴    x2−4>x+1∴    x2−x−5>0∴    x∈1+212,∞---iiCase II: (x+1)∈(0,1)⇒ x∈(−1,0)Clearly, this is not possible as  x∈(2,∞)
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