Find the Radius and Centre of Circle

We rearrange the equation, completing the square, so that we can write down the radius and coordinates of the centre of the circle.

[anonybunny]

thank you! With the current covid-19 pandemic and the shift to online, I've been having trouble in classes but this helped alot! keep up the good work!

[michellemarquez]

2x²+2y²+8x+4y-3=0

I have solved for the center = (-2, -1) but I don't know how to find the radius, what is the radius, and how to solve it?

[isabellabolanos]

could you please help me with this problem im stuggling
2x^2 + 2y^2 - 8x + 10y + 2 =0

[arshdeepsingh]

Can you please solve this problem: 3x^2 +3y^2 +6x-4y -1=0
I'm having difficulty in this problem

[nolin]

Nice work. Please work out write x^2+y^2+5x-2y-5 in terms of (x-a)^2+(y-b)^2=r^2. Thanks

[rio-sjlv]

how did 5/2 became 5/4 im so confused @2:20

[ititfliwttatwf]

Okay so I'm really is dumb on math, I don't understand what happened to 5/4?

[touchzonegamerz]

i have to find coordinates of the centre of circle for equation 2x^2 + 2y^2 + 2x -4y +7=0 are

[syantel]

Can you please help me answer this problem 9x^2+9y^2+12x+18y-23
I’ve started by dividing each term by 9

[mystic]

How to write the answer in general form?

[julianbarbosa]

hi I've trouble with this equation I don't how to solve it to find the radius and centre of the circle
9x^2 + 9x^2 - 27x +54 y = - 373/4

[yeshik]

Why did it become -(5/4)^2 when it should be positive (5/4)^2?

[richardangelop.matchino]

can you help me to answer this problem x^2+y^2-10x+9y+1? because I'm struggling in this problem

[metatronfernandezz]

hi, how about x^2+y^2-18x+25y+144=0 ? Thanks

[mariaclarissedino]

hi, why the second step will divided in to 2

[waskerdiaz]

umm hi ur not suppose to divide C, meaning the 10 by 2. that is only with G and F, which are, respectively, 5x and -8y

[asfi]

can you help me with 4x^2+4y^2+8x-16y-29=0

[ChaosGhost]

Doesnt the 2^2 at 3:14 need to be in brackets to make it a minus

[jeanangeles]

Please help me with mine. 2x²+2y²-2x+6y+3=0

[rio-sjlv]

what if its 9x^2+4^2, how will i didvide it by 2