Q.
The equation 1+logx27log3x+1=0 has
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a
no integral solution
b
one irrational solution
c
two real solutions
d
no prime solution
answer is A.
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Detailed Solution
1+32log3xlog3x+1=0 Let log3x=y, we get 1+32yy=−1 or 1+32y=1y2 or 2y+32y=1y2 or 2y2+3y−2=0 (∵y≠0) or 2y2+4y−y−2=0 or (y+2)(2y−1)=0y=1/2 or y=−2 (not possible) ⇒ x=31/2
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