Question

If the center is (-2,1) and a point on the circle is (2,7) put it in standard form.

Answer 1

genaneral form of circle is

(x - a)^2 + (y - b)^2 = r^2
where (a,b) is the centre and r = radius

Answer 2

you know the centre, and the radius is the length of the line joining the centre (-2,1) and the point (2,7)