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evtldocha
1 year ago

What exactly is the problem?

A rectangle has area A = a·b and here a = u and b = f(u). Therefore:

Now you need to be able to calculate the f(x) function of the straight line around f(u), and you can simply read it (I don’t even know what to expect seriously now)

and with it:

Then

Maximum of this function:

Since A”(u) < 0 is also the maximum at u = 15/6.

To calculate the maximum area, you will use u=15/6 in A(u).