Question

What is the equation of a circle with a center at (-4, -8) and a radius of 1.9?

Answer 1

use equation of circle again

http://www.regentsprep.org/Regents/math/algtrig/ATC1/circlelesson.htm

Answer 2

(x-k)^2+(y-h)^2=(r)^2

Answer 3

just plug in

(x+4)^2+(y+8)^2=(1.9)^2

Answer 4

(x+16)+(y+64)=3.61 ?

Answer 5

no silly you only square the r side :)

Answer 6

(x+4)^2+(y+8)^2=(1.9)^2

(x+4)^2+(y+8)^2=3.61

Answer 7

oopsy lol thanks!

Answer 8

:) btw

for example

(x+4)^2 is not x+16 the square is not distributed to the 4.

(x+4)^2 means

(x+4)*(x+4). usually they dont require you to expand it. But to do it you must use the FOIL. However you dont have to.