I need math help badly!

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WuShock
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We have this take home quiz and there is one part I don't understand, in the quiz he tells us to "determine the equation of a circle with a center at (-2,3) and passing though the origin" but he doesn't give us the radius. I have no idea how to solve this, I mean I got completely lost after (x-(-2))^2 + (y-3)^2 = r^2
 
We have this take home quiz and there is one part I don't understand, in the quiz he tells us to "determine the equation of a circle with a center at (-2,3) and passing though the origin" but he doesn't give us the radius. I have no idea how to solve this, I mean I got completely lost after (x-(-2))^2 + (y-3)^2 = r^2

If you know the center is at (-2,3) and you know the circle passes through the origin (0,0), you know the radius. It is just the distance from the center to the origin. radius=sqrt((-2)^2+3^3)
 
so r^2 = sqrt(13)?
 
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We have this take home quiz and there is one part I don't understand, in the quiz he tells us to "determine the equation of a circle with a center at (-2,3) and passing though the origin" but he doesn't give us the radius. I have no idea how to solve this, I mean I got completely lost after (x-(-2))^2 + (y-3)^2 = r^2
My guess is that the center of the circle is (-2,3). The origin is (0,0). So, it would seem that you would create a triangle and use the pythagorean theorem to solve for the radius . So the radius should be square root of 13? It has been a long time since I have done trig.
 
If you know the center is at (-2,3) and you know the circle passes through the origin (0,0), you know the radius. It is just the distance from the center to the origin. radius=sqrt((-2)^2+3^2)
Fixed?
 
you use the equation of the circle format [ r^2 = (x-h)^2 + (y-k)^2]

h is -2
k is 3

r (as shown earlier) is sqrt 13.

Therefore, EofaC is 13 = (x+2)^2 + (y-3)^2
 
Thanks for everyones help.

I have a new question though, what the hell is the Axis Of Symmetry and how do you figure it out?
 
Uh, are you supposed to get help on a Take-Home Quiz?
 
Uh yeah, the reason it's a take home is because we get such bad scores on the tests.
 
Uh yeah, the reason it's a take home is because we get such bad scores on the tests.
Classic. You're all failing the real tests, so they decide to let you cheat on the take home quizzes.

Now that's education!!
 
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Classic. You're all failing the real tests, so they decide to let you cheat on the take home quizzes.

Now that's education!!
I'm not failing, the teachers test are just notoriously hard. Hell even he thinks 80-85% on one of his tests is a good grade and I typically get something around there, maybe a little lower.
 
I'm not failing, the teachers test are just notoriously hard. Hell even he thinks 80-85% on one of his tests is a good grade and I typically get something around there, maybe a little lower.

That isn't a hard test.

I had a physics professor that would make his tests so hard that with the curve, a 30% would be an A.
 
That isn't a hard test.

I had a physics professor that would make his tests so hard that with the curve, a 30% would be an A.

LOL, that reminds me of an Asset Pricing class I took where I didn't get a single answer right and still got a B+.
 
We have this take home quiz and there is one part I don't understand, in the quiz he tells us to "determine the equation of a circle with a center at (-2,3) and passing though the origin" but he doesn't give us the radius. I have no idea how to solve this, I mean I got completely lost after (x-(-2))^2 + (y-3)^2 = r^2

Just wondering, what class is this and for which degree are you studying?
 
LOL, that reminds me of an Asset Pricing class I took where I didn't get a single answer right and still got a B+.

I took "Physical Chemistry", which was calculus-based chemistry (determining a position of a molecule, eigenfunctions, blah blah blah etc) my junior year. that shit was so fucking abstract and fucked up, I had no idea what the fuck was going on...still got a B+ in that class. weird shit. dunno how i pulled that off, i think it was because it was all based on a curve?
 
Just wondering, what class is this and for which degree are you studying?
College Algebra and Political Science

It's the only class I still need to graduate... which kinda tells you what I think of math. :lol:
 
College Algebra and Political Science

It's the only class I still need to graduate... which kinda tells you what I think of math. :lol:

One of the reasons I chose my undergraduate university was it's lack of a math requirement. There was a Social Science, Humanities and Natural Science requirement. Math fell under Natural Science. After I graduated without taking a math class, I ended up in finance. When I went back to grad school, lo and behold, there was a little math required. I had to then hustle and take several accelerated math classes with the undergrads while I was taking clases where I had to learn the math along with learning the theory--pretty embarrassing.
 
HCP is your man!

Oh ... wait ... you said math? Uh ... sorry ... vowel confusion. Carry on.

-Pop
 
I had a history class once where the entire grade was based on a single paper due at the end of the term. I didn't turn the paper in. I got a B.

barfo
 
I had a history class once where the entire grade was based on a single paper due at the end of the term. I didn't turn the paper in. I got a B.

barfo
If my teacher was young, I would of done it too...
 
I had a history class once where the entire grade was based on a single paper due at the end of the term. I didn't turn the paper in. I got a B.

barfo

So you were banging the teacher eh?
 
Grade inflation, ftl.

I wish more of my profs believed in it.
 
Grade inflation, ftl.

I wish more of my profs believed in it.

You go to Case Western, right? Or is it Carnegie Mellon? I get confused between the two. If you go to school in Cleveland, a buddy of mine just joined the faculty.
 
So you were banging the teacher eh?

Ew. He was a he, and about 80 years old.

No, it was just a stroke of luck on my part. I did nothing to deserve it.

barfo
 

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