00:01
So these tangent line problems, you need to know your x coordinate, which they tell you.
00:06
I'm going to call it x1, though.
00:08
You need to find your y coordinate.
00:10
You need to find your slope, which the slope is the derivative when x equals 2.
00:18
And the reason why you need this is in point slope form written like this.
00:25
I prefer this form.
00:28
All you have to do is fill in the blanks.
00:30
What's your m, what your x1, what's your y one.
00:32
Well, we already know the x -1.
00:34
We also know the equation they tell you is x minus 1 over x cubed.
00:46
Well, if we plug two into this problem, here and here, we get 2 minus 1 -half, which i hope you know already is 3 halves.
00:57
Well, if you cube that, you'll get 3 times 3 times 3 is 27 over 8.
01:02
I just found the y -cordinate.
01:05
And now what we need is the derivative of this...