00:01
We need to complete the square in order to write the equation of the circle in standard form.
00:05
We need to identify the center and the radius.
00:07
And if we can't, we need to explain why.
00:12
So we're first going to rewrite this.
00:14
We have x squared plus x, leave some space plus y squared minus six fifths y, leaves some space equals one.
00:22
We take the middle term, which is one divided by two, and we square it and we place it here.
00:27
So that's plus one fourth.
00:28
And we add one fourth to the other side of the equal sign.
00:32
We take the negative six -fifths divided by two and square it.
00:37
So negative six, oops, negative six -fifths divided by two, and then we square it.
00:44
So that becomes nine over 25.
00:48
So that's plus nine over 25...