International A Level (P1) - exam question on completing the square (7 marks)

International A Level - exam question on completing the square (7 marks). I rewrite the f(x) as ax^2 +bx+c and then complete the square. I then used both f(x) to find the coordinates of P, Q & R. I found the triangle's base and then used 1/2 base x height to find the area.