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

Quadratic Formula

Works for all quadratic equations

$ax^2 + bx + c = 0$

x = rac{-b pm sqrt{b^2 - 4ac}}{2a}

Number in front of $x^2$

Number in front of $x$

The constant term

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

To prevent mistakes, especially with minus signs

Two solutions

Use both plus (+) and minus (-) to find two solutions