Further, it may be observed
from the graph of the function that f  has no maximum value
and hence no point of maximum value of  f  in R ANote  If we restrict the domain of  f to [– 2, 1] only,
then f will have maximum value(– 2)2 = 4 at x = – 2 Example 15 Find the maximum and minimum values
of  f , if any, of the function given by f(x) = |x|, x ∈ R Solution From the graph of the given function
(Fig 6