Name: 07-3 多項式的切線（Tangents of polynomials | Derivative rules | AP Calculus AB | Khan Academy）
Uploaded: 2022-07-12T12:31:26.000Z
Duration: 4 min 42 s
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So, this is X equaling one right over here.

And what we want to do is find the equation

And if you are inspired I encourage you to be,

if we find the derivative at X equals one

the derivative is the slope of the tangent line.

And so we'll know the slope of the tangent line.

and then we can use that to find the equation

So we want the equation of the tangent line

So let's just first of all evaluate F of one.

That looks like about negative nine right over there.

The scales are different on the Y and the X axis.

And now let's evaluate what the derivative is

You take the derivative of X to the third

And if you view this as X to the first power

And then the derivative of a constant here

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07-3 多項式的切線（Tangents of polynomials | Derivative rules | AP Calculus AB | Khan Academy）

constant

negative

encourage

prime