00:01
In this problem, we will cover the tangent line of a function.
00:04
So we want to find the tangent line equation for this function at the point 1 -1.
00:10
And to do so, we must first find the slope of the tangent line.
00:15
And to find the slope, we have to use the derivative.
00:18
And we know that the derivative, in this case, is going to have the form, let's see, f -prime 1 equals the limit as x approaches 1 of f -x, minus f1 over x minus 1.
00:36
So then we know what f of x is.
00:39
We know what f of x is.
00:41
So we have the limit as approaches 1 of 1 over square root of x minus 1 all over x minus 1.
00:52
And after a series of complicated rewritings, we will get that the limit as x approaches 1 of negative 1 over 2x, and the slope we will find to be negative 1 half...