The equation x"squared" + y"squared" - 2x + 2y -1 = 0 is the general form of the equation of a circle. What is the standard form of the equation?

Question

campbell_st · Answer

complete the square in x and y

$$x^2 -2x + y^2 + 2x = -1$$

what needs to be added to make a perfect square in x and a prefect square in y. 

add those values to both sides of the equation then factor and the equation will be in the form 

$$(x - a)^2 + (y + b)^2 = r^2$$

hope it helps

anonymous · Answer

can you explain it a lil more plzz