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Topic: help me pllllz
Replies: 1   Last Post: Oct 29, 2013 8:05 AM

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Torsten Hennig

Posts: 2,419
Registered: 12/6/04
Re: help me pllllz
Posted: Oct 29, 2013 8:05 AM
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> for what value of c will the circle with equation
> x^2+6x+y^2-4y+c=0 have a radius of 4

Rewrite the above equation in the form
(x-x0)^2 + (y-y0)^2 = r^2
and set the r^2 you obtain (depending on c) to 4^2.
Then solve for c.
The result will be c=-3.

Best wishes

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