Write the equation of the circle by completing the square. x 2 + 4x + y 2 - 2y =

so hmm we're missing a couple of folks, one in each group, to get a perfect square trinomial

now, recall 

so.. the middle term of a perfect square trinomial, is really 2 * the other 2 guys

so hmm we can say 2 * x * ? = 4x, thus 2x * ? = 4x, thus cross-multiplying
? = 2

now, for the other, 2 * y * ? = 2y, thus 2y* ? = 2y thus ? = 1

so our guys are 2 and 1

now, bear in mind, all we're doing, is borrowing from our very good friend Mr Zero, 0, so, if we add whatever, we also have to subtract whatever

thus   

bruh

Step-by-step explanation:

idk