Question

Sorry, guys. Just want to make sure I don't get a bad grade! Is this correct? center ( 7, -3), radius = sqrt 7 @nikato @AdrDiazEs

Answer 1

NO
THIS IS THE ANSWER ----> (x-7)^2 + (y+3)^2 = 7

Answer 2

Don't write the X twice, the first is x, the second is Y :) and sqrt 7 squared is 7 .. that's why :)

Answer 3

Yea, sqrt 7 x sqrt 7= 7 not 49

Answer 4

http://www.mathwarehouse.com/geometry/circle/images/equation-of-circle/general-formula-equation-of-circle.png

Answer 5

Oops, I didn't mean to and ahh I forgot to square the second section. Thank you!

Answer 6

Hope I'm not bothering you guys, if I am just let me know. How do I do this one? @AdrDiazEs @nikato

Answer 7

look at the picture... what do you think?

Answer 8

I have no idea :x

Answer 9

Just use the same formula

Answer 10

x^2 + (y-8)^2 = 64

Answer 11

(X-0)^2 is simply x^2 when simplified

Answer 12

This is the formula
(h;k) r=radium
(x-h)^2 + (y-k)^2 = r^2

Answer 13

\( \begin{array}{llll}
center\qquad (&0,&8)\qquad radius &8\\
&h&k&r
\end{array}\implies
\begin{array}{llll}
(x-h)^2+(y-k)^2=r^2\\ \quad \\
(x-(0))^2+(y-(8))^2=(8)^2
\end{array}\)

Answer 14

Ohh I see. But I don't have the ^ symbol or the space, do I just put \[x ^{2}+(y-8)^{2}=64?\]

Answer 15

I think you're meant to use ^ from the keyboard

Answer 16

It's drag and drop, my choices are at the bottom in the pic :x

Answer 17

@AdrDiazEs

Answer 18

YES! that's right :)

Answer 19

Okay, do you mind showing me how to complete this?

Find the coordinates for the center for this circle.

(x + 3)² + (y - 5)² = 25

Answer 20

center is (-3,5)

Answer 21

rememeber that formula

Answer 22

The center is (-3;5) :)

Answer 23

Okay, but how do I figure that out

Answer 24

because those are the numbers H and K that you used before... remember?

Answer 25

I just do the formula backwards? Lol

Answer 26

find what was pluggged in for h and k

Answer 27

Oh, I see. Thanks again!

Answer 28

You can replace values of X and Y ... and try to figure out by making your own graph. :)

Answer 29

What about

Find the length of the radius for this circle.

(x - 3)² + (y - 5)² = 8

my choices are 4, 8, and \[2\sqrt{2}\]

I think it is \[2\sqrt{2}\] is that right?

Answer 30

yup remeber in the formula it was r^2

Answer 31

That's what I thought :) Thanks!