Correct Answer: Option B
log(x-1)+log(x+1)=log21
log(x-1)+log(x+1)=0
log[(x-1)(x+1)]=0
Since, log 1 = 0
(x-1)(x+1) = 1
x2-1=1
x2=2
x=± √2
Since, log of negative number is not defined.
Therefore, x=√2
Download our app for free and access thousands of MCQ questions with detailed solutions