Question

What is the equation of this circle?

(x + 1)2 + y2 = 2

(x – 1)2 + y2 = 4

(x + 1)2 + y2 = 4

(x – 1)2 + y2 = 2

Answer 1

You probably need to choose one of the two middle ones. You can see that the radius is 2 and that 2 squared is 4 which is what the constant on the right of the equal sign. So now you just need to decide is it (x-1) or (x+1) squared.

Answer 2

is its (x-1) squared?

Answer 3

I think it is. Do you have the formula for a circle handy?

Answer 4

(x-h) squared +(y-k) squared = r squared

Answer 5

I think its (x+1) bc the the coordinates in the equation is the opposite sign

Answer 6

ok then k=-1 from the drawing.so -k would be 1 (x+1)^2
Does that make sense??

Answer 7

yes thanks :)

Answer 8

It is confusing I admit, and I hope I thinking clearly lol. Good luck with it.