00:01
So we've got an equation for revenue of a pool company here.
00:04
It's revenue is 1500x minus 3x squared, where x is the number of pools sold, and it's got to be less than 25.
00:16
Okay, so we're given that as the domain.
00:19
So how many pools would they have to sell to get a revenue of $17 ,568? okay.
00:25
So, in other words, when would this, 15 ,000 x minus 3x squared, equals 17 ,568? all right, so i'm going to start by dividing both sides by 500.
00:46
Actually, i'm going to rearrange this too, just to make my life a little bit easier.
00:52
So let's make it negative 3x squared plus 5 ,500x.
00:59
And what i'll do is divide everything by negative 3.
01:03
So that would give me x squared minus 500x equals negative 5 ,856.
01:19
Okay, so now i can use completing the square to solve this...