A-Level Maths OCR B (MEI) (H640)

Understand and be able to use the method of completing the square to find the line of symmetry and turning point of the graph of a quadratic function and to sketch a quadratic curve (parabola).

• The curve $y = a(x + p)^2 + q$ has
• a minimum at $(-p, q)$ for $a > 0$ or a maximum at $(-p, q)$ for $a < 0$
• a line of symmetry $x = -p$.