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? 發問於 科學及數學數學 · 1 十年前

application of differentiation

Consider the curve y=x^3-9x^2+15x+9

a) find dy/dx , and hence find the range of x such that dy/dx<=0

b)Find the turning points of the curve and test whether it is max. or min. pt.

c)sketch the graph in the stated range in (a) ,

hence show , in a separate, the shape of the curve y^2=x^3-9x^2+15x+9

And you can just anwer the question in part c) only.thx=]

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