Q.
Domain of definition of the function f(x)=log(|x|−1)x2+4x+4 is
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a
[−3,−1]∪[1,2]
b
(−2,−1)∪[2,∞)
c
(−∞,−3⌋∪(−2,−1)∪(2,∞)
d
None of these
answer is C.
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Detailed Solution
Case I: 0<|x|−1<1 i.e., 1<|x|<2 Then x2+4x+4≤1⇒ x2+4x+3≤0⇒ −3≤x≤−1 So x∈(−2,−1) ∵x2+4x+4>0Case II: |x|−1>1 i.e., |x|>2, then x2+4x+4≥1⇒ x2+4x+3≥0x≥−1 or x≤−3 So, x∈(−∞,−3]∪(2,∞)
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