# Thread: Equation of cirlcle in standard form.

1. ## Equation of cirlcle in standard form.

Write the equation of the circle in standard form. Then give the center and radius.

10x^2+10y^2=100

So far I have:
(x-0)^2+(y-0)^2=100
(x-0)^2+(y-0)^2=10^2

I don't think it is correct though. Thank you in advance.

2. Originally Posted by theevilp0ptart
Write the equation of the circle in standard form. Then give the center and radius.

10x^2+10y^2=100

So far I have:
(x-0)^2+(y-0)^2=100
(x-0)^2+(y-0)^2=10^2

I don't think it is correct though. Thank you in advance.
it's not correct. the radius is off. what problem do you see with it?

3. ## The problem I see with this

is how you came up with $\displaystyle (x-0)^2+(y-0)^2=100$...something is fishy about that...*cough*division mistake*cough*

4. Originally Posted by Jhevon
it's not correct. the radius is off. what problem do you see with it?
Well, I'm not even sure. It doesn't look right to me. The center is correct? I got the answer for the radium by finding the square root of 100, which is 10. What should I be doing to correct this?

5. Originally Posted by theevilp0ptart
Well, I'm not even sure. It doesn't look right to me. The center is correct? I got the answer for the radium by finding the square root of 100, which is 10. What should I be doing to correct this?
you originally had 10 in front of the x^2 and y^2, what happened to them?

6. Originally Posted by Jhevon
you originally had 10 in front of the x^2 and y^2, what happened to them?
I have no idea how I came to that deduction to be honest. My attempt at trying to divide them out. I know how to solve the equation with other variables like x^2+y^2+Dx+Ex+F=0 into standard form, but I can't do this one.

Should I be trying to get the 10s on the other side of the equation?

7. ## Here

$\displaystyle 10x^2+10y^2=100$...now divide by ten to get $\displaystyle x^2+y^2=10$ making the center $\displaystyle (0,0)$ and the radius $\displaystyle \sqrt{10}$...you just didnt divde 100 by 10

8. Originally Posted by theevilp0ptart
I have no idea how I came to that deduction to be honest. My attempt at trying to divide them out. I know how to solve the equation with other variables like x^2+y^2+Dx+Ex+F=0 into standard form, but I can't do this one.

Should I be trying to get the 10s on the other side of the equation?
so you just forgot about the 10s?!

MathStud told you what happened