6. f(x)=9x++ 142x3 + 102x - 1386x + 3 has a maximum or minimum at the...

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6. f(x)=9x++ 142x3 + 102x - 1386x + 3 has a maximum or minimum at the points where x = 1.5 and where x = -. Use instantaneous rates of change to verify this, and to classify each as a maximum or a minimum. [8 marks] 6. f(x)=9x++ 142x3 + 102x - 1386x + 3 has a maximum or minimum at the points where x = 1.5 and where x = -. Use instantaneous rates of change to verify this, and to classify each as a maximum or a minimum. [8 marks]