NEED HELP!!
Question: Using the following equation, find the center and radius of the circle. You must show all work and calculations to receive credit.
Equation: x^2 - 4x + y^2 + 8y = -4

Question

NEED HELP!! 
Question: Using the following equation, find the center and radius of the circle. You must show all work and calculations to receive credit. 
Equation: x^2 - 4x + y^2 + 8y = -4

loser66 · Answer

Where are you stuck?

anonymous · Answer

I really just don't know hwere to start.

loser66 · Answer

Do you know how to complete the square?

anonymous · Answer

Yes

loser66 · Answer

Ok, do it for me for both x and y.
I meant x^2 -4x +................. to get a complete the square for x
            y^2+8y +.................. to get a complete the square for y

anonymous · Answer

okay, so would i use the equation (x -a) ^2 + (y-b) ^2 = r^2?

loser66 · Answer

Of course, but first off, you must complete the expressions above.

anonymous · Answer

I don't know how to solve the expression... Can you walk me through it?

anonymous · Answer

So, is 4 the center?