How do I differentiate this?​

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Step-by-step explanation:

I'm sure you are familiar with the product rule,

If y = u*v => dy/dx = u * dv/dx + v * dy/dx <----- product rule

In this case:

Now remember the sum rule:

For this second bit we apply the chain rule:

If we substitute these values back into the expression...

...we get the following:

The rest is just pure simplification:

Now let's equate this to equal 8 for the second bit and solve for x:

the graph on the bottom right

typically if you want , you would actually put questions here for us to you. but hey, that's just me. maybe someone will magically answer the questions for you without knowing what they are.