Summary (Grade 11 NSC Matric Mathematics): Quizzes

If $a \times b = 0$, then $a = 0$ and/or $b = 0$

$x = 4$ or $x = -2$

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

$\Delta = b^2 - 4ac$

The roots are non-real (complex numbers)

The roots are real and equal

The roots are real and unequal

If $\Delta$ is a perfect square

Otherwise the equation wouldn't be quadratic

If the quadratic can be factorised