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Q.

Solution set of the inequation log0.8⁡log6⁡x2+xx+4<0 is

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a

(−4,−3)

b

(−3,4)∪(8,∞)

c

(−3,∞)

d

(−4,−3)∪(8,∞)

answer is D.

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Detailed Solution

log0.8⁡log6⁡x2+xx+4<0⇒ log6⁡x2+xx+4>1⇒ x2+xx+4>6⇒ x2+xx+4−6>0⇒ x2−5x−24(x+4)>0⇒ (x−8)(x+3)(x+4)>0From the sign scheme of (x−8)(x+3)(x+4),x∈(−4,−3)∪(8,∞)
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Solution set of the inequation log0.8⁡log6⁡x2+xx+4<0 is