Question

2log x-log 5 =-2?

Answer 1

`x=sqrt5/10`

Explanation:

As `2logx-log5=-2`

`2logx=-2log10+log5`

or `logx^2=log(5/10^2)`

or `x^2=5/10^2`

or `x=sqrt5/10`

Observe that though there could have been an answer `x=-sqrt5/10` too, but this does not in domain and hence has been omitted.