00:01
We are asked to determine where this function is increasing or decreasing.
00:05
Now, we do have a square root, so that does take a little bit of note.
00:11
We have the square root of x plus one.
00:13
If what's inside that square root were to be negative, then we could actually get a non -real answer.
00:20
Well, x plus one is less than zero whenever x is less than negative one.
00:26
So it's understood here that x must be greater than or equal to negative 1.
00:34
Additionally, in order to take the derivative, it's probably simpler to rewrite that as x plus 1 to the 1 half power.
00:44
The derivative of that function would follow the chain rule.
00:48
We would bring the power out front.
00:52
We would subtract one from the power.
00:54
And then we'd multiply by the derivative of the inside, but that derivative is simply 1.
01:01
So we have 1 over 2 square root x plus 1...