Question

How do you write the equation of the circle with center (4, 0) and `r=sqrt5`?

Answer 1

`(x-4)^2+y^2=5`

Explanation:

center(4,0)
r=`sqrt5`
circle can be thought as a set which every points to the center are same distance
use distance formula to describe
`sqrt((x-4)^2+(y-0)^2)=sqrt5`
`->(x-4)^2+y^2=5`