Solving quadratic equations (OCR GCSE Maths): Flashcards

Power of 2 (e.g., $x^2$)

Three

Factorising, quadratic formula, completing the square

Always get two answers

Positive & negative numbers squared give same value

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

$ax^2+bx+c=0$

No real solutions

Rearrange equation to equal zero

Both positive and negative values

Factor it out first

Consider both +ve and -ve roots