Q.
The equation xlog3x2−(9/2)log3x+5=33 has
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a
at least one real solution
b
exactly three real solutions
c
exactly one irrational solution
d
complex roots
answer is A.
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Detailed Solution
Given equation isxlog3x2−(9/2)log3x+5=33or xlog3x2−(9/2)log3x+5=33/2or log3x2−(9/2)log3x+5log3x=32----iPut log3 X =tThen from Eq. (i),t3−92t2+5t=32or 2t3−9t2+10t−3=0or (t−1)2t2−7t+3=0or (t−1)t−12(t−3)=0∴t=12,1,3or log3x=12,1,3⇒x=3,3,27.
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