Quadratic Equations
A quadratic equation has the form ax² + bx + c = 0. It can be solved by factorising, completing the square, or the quadratic formula:
x = (-b ± √(b² - 4ac)) / 2a
Worked example
Solve x² - 5x + 6 = 0 by factorising: (x - 2)(x - 3) = 0, so x = 2 or x = 3.