The quadratic equation \(ax^2+bx+c=0\) has *solutions* \[x = \frac{ - b \pm \sqrt { b^2 - 4ac}}{2a}.\]

Quadratic equations can also be solved by completing the square, or sometimes by factorising them.

The quadratic equation \(ax^2+bx+c=0\) has *solutions* \[x = \frac{ - b \pm \sqrt { b^2 - 4ac}}{2a}.\]

Quadratic equations can also be solved by completing the square, or sometimes by factorising them.