Area of triangle

Point A(2, 2) and B(-1, -1) are both on the parabola y=x^2-2. Placing point P(p, p^2-2) on the parabola between points A and B, answer (a) and (b).

(a) Express the area of triangle ABP in terms of p.

(b) Find the values of p for which the area, S, of the region enclosed by AP, BP and the parabola will be at a minimum value.

係計算 (a) 同 (b) 時，使唔使搵AP同BP既equation??
如果要，佢地分別係乜???