Can't seem to be able to solve the below problem and I don't have any solved examples in my text books.

(a) Explain why the graph of the function lies below the x-axis for 2 < x < 3 and above the x-axis for 3 < x < 5.

(b) Use this fact to ﬁnd the area enclosed by the graph and the x-axis

between x = 2 and x = 5, giving your answer to four decimal places