Question

A circle is defined by the equation x2 + y2 – x – 2y – = 0. What are the coordinates for the center of the circle and the length of the radius?

Answer 1

Have you considered completing the square in both x and y?

(x^2 - x + ___) + (y^2 - 2y + ___) = ____ + ____

Answer 2

no

Answer 3

need help

Answer 4

You have not ever "Completed the Square"?

Answer 5

no

Answer 6

Ah, then only a couple things can be the case.

1) This is an entrance exam and you should get this one wrong so you can be placed in the correct class.
2) You have entirely forgotten your algebra.
3) Someone gave you a problem to play a joke on you. Clearly, you have not been given the correct tools to solve it.

Think on this: \((a+b)^{2} = a^{2} + 2ab + b^{2}\) That is all you need for "Completign the Square".

Answer 7

thanks