Note: Not all quadratic equations can be solved by factorisation. Quadratic equations which do not factorise can be solved by either completing the square or by using the quadratic formula.
For quadratic equations that do not factorise, you must complete the square or use the quadratic formula.
See also: Graphs of quadratic equations
See below a video demonstration of the easiest way to solve a quadratic equation, by factorisation:
See below a video demonstration of the easiest way to solve a quadratic equation, by factorisation:
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