In order to calculate the region which is bounded by the curve y = f (x), where x-axis and the lines x = a and x = b (b > a), you will use the formula ∫ba ydx =  ∫ba f (x)dx. To have a better comprehension of the exercise, use Vedantu’s NCERT Solutions Class 12 Maths Chapter 8 Exercise 8.2. It is comprehensive as it touches each and every important aspect of the questions - from stepwise solutions to the application of formulas.