Question

What is the standard equation of the circle with radius 5 and center (-3,-4)?

Answer 1

The standard equation of a circle centred at (a,b) with radius r is given by
\(\large (x-a)^2+(y-b)^2=r^2\)
Substitute (a,b) by (-3,-4), and r by 5 to get the desired equation.

Answer 2

Be very careful about the "-" signs when you do that substitution! Frequent source of error...

Answer 3

@whpalmer4
Very true! :)