00:01
So in this problem, i'm a big fan of the way they have this written.
00:05
And what i just wrote down is what's called the vertex form, because the vertex is actually the ordered pair h, k.
00:19
So in this problem, where they tell us that the vertex is negative 2, 3, if i go to rewrite that vertex form, let's write with that a there, there.
00:31
It's x minus negative 2, because that's how this form goes, squared, and then plus k, and the k value is 3.
00:43
But now is where the other situation comes into play, where it says it goes to the point 0, 8, because what that tells me is if i plug in 0 for x, i need to get 8 8 for y.
00:57
So i'm getting 8 equals a times, well, 0 plus 2 is 2 squared.
01:05
I'm going to do two things at once.
01:06
I can subtract 3 over...