Question

How do you solve `4/(sqrt(r+4))=2`?

Answer 1

`color(green)(r=0`

Explanation:

`4/(sqrt(r+4))=2`

`4=2 ( sqrt(r+4))`

Squaring both sides:
`4^2=(2 ( sqrt(r+4))^2`

`16=4 *(r+4)`
`16=4r+16`

`4r=0`

`color(green)(r=0`