21: The domain is
D( f ) = [0,∞).
The derivative is
![](gif6/ecc6bm2.gif)
Critical points: The equation
f ′(x) = 0 has solution
x = 1.
There are no points in D( f ) where the derivative
does not exist.
Intervals of monotonicity will be
[0,1] and
[1,∞).
Determine monotonicity and local extrema using a chart.
Next hint
Answer