00:01
We are going to find the absolute extrema for this function in the given interval.
00:06
So let's locate our critical numbers.
00:10
The derivative of our function is 3e to the x minus 2e to the 2x.
00:17
It's never non -differentiable because any x you fill in can give you a real answer.
00:23
So the only possible critical numbers are going to come if this derivative equals zero.
00:29
So we'll set it to zero.
00:33
We will factor out an e to the x, which would leave us with 3 minus 2e to the x.
00:44
Now this will equal zero if either the first term e to the x or the quantity equals zero.
00:50
But the first term, e to the x is never going to be zero.
00:54
If any power is positive.
00:58
So let's just look at the second set.
01:02
To solve that, let's subtract.
01:04
3, divide by the negative 2, and it'll give us 3 halves or 1 .5.
01:19
And if we take the natural log of both sides, we'd see the natural log of e to the x is x.
01:26
So x is natural log 1 .5.
01:29
And that is in the proper interval.
01:32
So now let's check to see what we get at our end points and our critical point...