Question

How do you solve `2log_7 (-2r)=0`?

Answer 1

`rArr r=-1/2`.

Explanation:

By Defn., `log_ba=m iff b^m=a`.

`;. 2log_7(-2r)=0`

`rArr log_7(-2r)=0`

`rArr 7^0=-2r`

`rArr 1=-2r`

`rArr r=-1/2`.