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A function is defined by

f(x)=xe−x,x≥0

The curve y=f(x) is sketched below:

  1. Find, in exact form, the coordinates of the turning point of the curve.

  2. Find the range of the function

    g(x)=2−2f(x)

For part (a), solve dydx=0


For part (b), consider the transformations

f(x)→2f(x)→−2f(x)→−2f(x)+2

and how they would affect the graph of the curve.


The range in part (b) is of the form

{y∈R:p≤y≤q}

The value of pq can be given in simplest form as

a−bce

Give the value of abc.