Q.

The number of negative roots of9x+2−63x+1+1=0 is

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a

0

b

1

c

2

d

4

answer is B.

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Detailed Solution

9x+2−63x+1+1=0Put  3x+1=t so that t2−6t+1=0⇒t=6±322=3±22⇒x+1=log3⁡(3+22)>1or x+1=log3⁡(3−22)<0
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