Solving Equations (Leaving Cert Mathematics): Quizzes

Quadratic formula

$az^2+bz+c=0$

Negative number under square root

Error from negative under square root

$2$

$-4$

$2i$

In conjugate pairs

The calculations

$-\frac{5}{2}$

$b^2 - 4ac$

When $b^2 - 4ac < 0$

$-1$

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

$2$

For exam marks

$ax^2+bx+c=0$

$-4$

Complex roots

$13$