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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