00:03
Okay, we have this function f of x, and we want to find the equation of the line that is tangent to our function at point p.
00:12
So what we're going to do first is we're going to label point p, x1 and y1.
00:19
And then we're going to write the equation of the tangent line, which is basically the point slope form of the equation of a line learned back in the algebra.
00:27
Y minus y1 equals m times x minus x1.
00:31
The x -1 and the y 1 are these two values right here coming from the point of tangency m the slope of the tangent line uh this is going to be to find the slope in the tangent line the slope of the tangent line is the derivative of the function because the derivative of the function is to slope with the curve so the slope of the tangent line is the slope of the curve the derivative of the function.
00:58
So m will be the derivative of our function, f of x, evaluated at the x coordinate from the point of tangency.
01:10
So the slope of the tangent line, since this line is tangent to the function at this point, in particular when x is 1, the slope of the tangent line is going to be f prime of x when x is 1.
01:22
So f prime of 1 is going to be our slope...