PLEASE HELP! WILL FAN AND MEDAL! :):)

Using the following equation, find the center and radius of the circle. You must show all work and calculations to receive credit.

x2 − 4x + y2 + 8y = −4

Question

PLEASE HELP! WILL FAN AND MEDAL! :):)

Using the following equation, find the center and radius of the circle. You must show all work and calculations to receive credit.

x2 − 4x + y2 + 8y = −4

anonymous · Answer

I know the steps and formulas.. i just cant get the order right and im afraid im missing a step or two!

jim_thompson5910 · Answer

what do you have so far?

anonymous · Answer

The general equation of a circle is:
x2+y2+2gx+2fy+c=0....where the center is:
(−g,−f)

so if you subtract 4 from both sides of the equation you get:
x2+y2−4x+8y+4=0

2g is -4 and 2f is 8
so the center is (-g,-f) which is (2,-4)

anonymous · Answer

thats all i can remember how to do... but i know theres more to the equation that im missing...

jim_thompson5910 · Answer

ok let me look through what you posted