00:01
Here, we're given the equation y, which is equal to x cubed plus x, at the point negative 1, common negative 2.
00:08
And we want to find the equation of the tangent line.
00:10
So let's start off by finding the slope from the derivative, which is 3x squared plus x.
00:16
So if i plug in that negative 1, we're going to get 3 times 1 plus 1, so 4.
00:21
Now all we have to do is say y equals y0 plus m times x minus x.
00:27
So y0 is negative 2.
00:31
M, we just found, that's the derivative.
00:32
It's 4 times x minus x not.
00:35
Again, we were given that...