Solve Quadratic Equations (HSC SSCE Mathematics Advanced): Quizzes

$ax^2 + bx + c = 0$ where $a \neq 0$

$x^2 + 5x + 6 = 0$

If $ab = 0$ then $a = 0$ or $b = 0$

Multiply to $c$ and add to $b$

$a \times c$

Square of half the $x$-coefficient

Divide all terms by $a$

$x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$

When factorisation is difficult

Forgetting the negative sign before $b$