What is the center and radius of the circle with equation (x - 5)^2 + (y + 3)^2 = 16?

Question

directrix · Answer

Look at the attached description of how to get the center and radius. Post what you get and we'll compare answers. Okay? @linhsanityy

anonymous · Answer

@Directrix I think i get this now! is it (x+5)^2 + (y-3)^2 = 256 ??

anonymous · Answer

@directix Oh oops I wrote the equation .. nvm.. one sec let me re do this

anonymous · Answer

@Directrix is it center (5, -3); radius = 16 ?

directrix · Answer

The center is correct.
Try again on the radius.

directrix · Answer

Hint: the radius in the circle you posted has been squared. What you see as 16 is r^2.

anonymous · Answer

@Directrix Oh! so the radius would be 8???

directrix · Answer

Square rooting and taking half are not the same.

What is the positive square root of 16? That is the radius.

anonymous · Answer

Oh.. so it's 6? @Directrix

directrix · Answer

6 times 6 = 36 so 6 is not the radius.

You want a number such that the number times itself equals 16.

What is it? You'll get it this time!  @linhsanityy

anonymous · Answer

4!!! hahha sorry I didnt mean to type in 6 .. ! >_< @Directrix

directrix · Answer

That is correct.

anonymous · Answer

Thank you so much! @Directrix

directrix · Answer

Happy to help @linhsanityy