Question

What is the radius of the circle given by the equation below?

Answer 1

haha these are so easy

Answer 2

D

Answer 3

The best way to do this one is to write everything in terms of y and then plug it into a graphing calculator. But the other by hand method would be factoring the formula given. Hope I helped.

Answer 4

not really
you have to first write at
\[x^2-6x+y^2-18y=-26\] and then complete the square twice

Answer 5

forget the graphing calculator
or any calculator
do you know how to complete the square ?

Answer 6

@satellite73 I think using b/2 right?

Answer 7

yeah you have to do it twice
\[(x-3)^2+(y-9)^2=-26+9+81\]

Answer 8

or
\[(x-3)^2+(y-9)^2=64\] making the center \((3,9)\) and the radius \(\sqrt{64}=8\)