Finding the center and radius of a circle

[sbsbsbsbsb]

Ok i need to find the center and the radius of each circle.
I know the equation is (x-a)^2 + (y-b)^2=r^2 with a and b representing the center of the circle and r is the radius.

ok one question is (x+7)^2 + (y-8)^2 = 36/25
i got the center is (7, -8) and the radius is 6/5 is that right?

The other question im completely confused on its:
(x+a)^2 + (y-b)^2= c^2

Please help if possible!!
Thanks

 

[BigGlenntheHeavy]

\(\displaystyle (x-h)^2+(y-k)^2 \ = \ r^2, \ Standard \ form \ of \ a \ circle.\)

\(\displaystyle Center \ = \ (h,k), \ and \ radius \ = \ r.\)

 

[sbsbsbsbsb]

so is my answer in the 1st question right?

 

[Denis]

so is my answer in the 1st question right?

YES! You need more confidence in yourself.

(x+a)^2 + (y-b)^2= c^2

Center is (a,-b) and radius = c ; got that?

 

[sbsbsbsbsb]

Ok wow i thought that it was a lot more complicated than that so i thought i was wrong haha