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Re: help me pllllz
Posted:
Oct 29, 2013 8:05 AM


> for what value of c will the circle with equation > x^2+6x+y^24y+c=0 have a radius of 4
Hint: Rewrite the above equation in the form (xx0)^2 + (yy0)^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 Torsten.



