Solving Quadratic Equations using the '-b Formula' (Junior Cert Mathematics): Flashcards

Quadratic Formula

All quadratic equations

$ax^2 + bx + c = 0$

Number in front of $x^2$

Number in front of $x$

The constant term

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

Identify values of $a$, $b$, and $c$

Prevents mistakes, especially with minus signs

Two solutions

$\pm$ (plus or minus)

$x = 3$ or $x = 1$