Q12 a) i) Given that X - -2, find the equation of y (x > 0). [3 marks] ii) The point B (e , 3) is on the curve with equation y found in question a) i) . Find a full expression of y. [6 marks] b) i) Given the first derivative f '(X) = ex - 1, find f(x) [3 marks] ii) Hence find A = (ex - 1)dx leaving your answer in the form a - In(b) where a is a fraction and b is a whole number. [5 marks] iii) Describe what A represents. [3 marks]