Show from first principles that the derivative of Hence confirm the result outlined in blue in Section

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Show from first principles that the derivative of

is f(x) = ax + bx + c f'(x) = 2ax + b

Hence confirm the result outlined in blue in Section 2.3.4 and using the calculus method verify the results of this example.


Data from Section 2.3.4 

Thus, when a > 0, f(x) has a minimum value (4ac - b)/(4a) where x = -b/(2a). When a <0. f(x) has a maximum

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