00:01
Okay, so we are asked where this function g, which is the function that i have graphed, is differentiable.
00:11
So let's first look on the interval negative infinity to zero.
00:19
Now, we just need to check to see if the function is differentiable on zero.
00:25
So we need to make sure that the derivative coming from the left at zero is going to be equal to the derivative coming from the right.
00:32
At zero.
00:33
So the derivative coming from the left, it will call f prime plus is going to be equal to two.
00:40
The derivative coming from the right is that we'll call f prime minus x is going to be two minus two x.
00:55
So now we just want to evaluate both of these at zero and see that they're equal.
01:00
So this is going to give us 2 equal to 2.
01:03
So the function is differentiable at 0.
01:06
So that's our first interval.
01:08
Now we want to look from 0 to 2.
01:16
And let's see if it's differentiable at 2.
01:19
So let's look at the derivative from the left, which is going to be 2 minus 2x.
01:26
And then the derivative from the right, which is going to be minus 1...