Say you have a graph with an equation like this:

You can differentiate this equation using the below formula.

In this equation, n is 2, so to differentiate this equation, the number 2 has to be before the x and the power has to be subtracted by 1. So we will get this equation:

means the derivative of y with respect to x.

Differentiating a graph can allow you to find the gradient of a tangent at a certain point. If you replace the x with the x-coordinate of the point in the differentiated equation, you can find the gradient. For example, if we wanted to find the tangent of a graph where x was equal to 2, we would have to substitute 2 for x.

Here the gradient of the tangent at x = 2 is 4.

If you have an equation where different terms of x are added or subtracted, you differentiate each term separately. For example,

You can see how each separate term has been differentiated in this example.

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