00:01
There's several ways that people teach to graph.
00:06
And i'm not saying my way is the best.
00:11
I try to keep it as simple as possible.
00:13
But it's also with the understanding that you know a few things.
00:17
For instance, you know that the axis of symmetry's formula is negative b over 2a, and you know that a is negative 2, b is 3.
00:29
Now, i'm going to talk about the c value eventually, i'm going to change colors when i do that.
00:33
So you do negative 3 over 2 times negative 2.
00:39
And so what we're looking at is negative 3 over negative 4.
00:43
So the axis of symmetry is at 3 4.
00:46
So i'm just going to put a vertical line because that's the axis of symmetry is x equals 3 4.
00:52
And then the vertex is located through the axis of symmetry.
01:00
So what you have to do is figure out what f of, of three -fourths is.
01:07
And yeah, you have to plug in three -fourths for all those xs plus five.
01:17
There you go.
01:18
So what i would probably do, since three squared is nine times negative -2 is negative -18, and four squared is 16, i would probably get all of these to be a denominator of 16.
01:30
I don't even know if that's the best idea.
01:31
But three times three is nine, that you'd have to multiply by four, which would be 36.
01:39
Let's see...