Write the equation of the circle in standard form. Find the center, radius, intercepts and graph the circle. x^2+y^2+14x+18y=-81

Answer 1

rearrange things a bit:

x^2+14x + y^2+18y = -81
x^2+14x+49 + y^2+18y+81 = -81 + 49 + 81
(x+7)^2 + (y+9)^2 = 49

now the rest is easy.
C'mon back if you get stuck.

Answer 2

my math problem is a little different, but I still got this far... my center is (8,-4) and radius is 3 square root of 10... how do I plot a radius like that?