00:01
So f of x is equal to 6x squared minus 6x.
00:04
For part a, first thing we want to do is if it has a minimum or maximum value without graphing.
00:09
With this positive 6, i know it's going to graph is going to look like this since it's a positive number.
00:14
And from the x squared, so that means it has a minimum value.
00:19
Okay, for part b, find the minimum or maximum value.
00:23
That's basically just finding the vertex.
00:25
So i'm going to do x equals a negative b divided by 2a.
00:29
So that's going to be a negative of negative 6 divided by 2 times 6.
00:33
So that's 6 over 12, which is equal to 1 1⁄2 here.
00:39
So that i find f of 1 1⁄2 by doing 6 times 1⁄2nd, minus 6 times 1⁄2...