Q.
The number of roots of the equation log3xx+log3xx=0
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a
1
b
2
c
3
d
0
answer is B.
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Detailed Solution
logxlog3+(1/2)logx+(1/2)logxlog3+logx=0⇒ log3x1+(1/2)log3x+12log3x1+log3x=0 Let log3x=y, we get y1+(y/2)+y2(1+y)=0 or y22+y+12(1+y)=0 or y[4+4y+2+y]=0⇒ y=0 or y=−6/5⇒ log3x=0 or log3x=−6/5⇒ x=1 or x=3−6/5
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