Question

What is the standard form of the equation of a circle with (-1,7) and radius 2?

Answer 1

`(x+1)^2+(y-7)^2=4`

Explanation:

A circle with center `(a,b)` and radius `r`
has the general formula:
`color(white)("XXX") (x-a)^2+(y-b)^2=r^2`

graph{(x+1)^2+(y-7)^2=4 [-9.9, 10.1, -0.89, 9.11]}