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- In a certain company, the income from the sale of x thousand pieces of products is given by I (x) = 9x, while the cost of making the same x products is given by C (x) = x ^ 3-6x ^ 2 + 15x + 1. Assuming that I and C are in thousands of dollars and everything produced is sold, what is the maximum profit the producer can make? Argues using first or second derivative criteria.If f(x)=x4 and g(x)=x3, then f′(x)=4x3 and g′(x)=3x2. The Chain Rule multiplies derivatives to get 12x5. But f(g(x))=(x3)4=?12 and its derivative is NOT 12x5. Where is the flaw?On equation (iv), why is d/dz of 3z^3 is equal to 3z^2, shouldn't it be 9z^2?