A Quadratic equation has the general form:

### ax2+bx+c=0

These can sometimes be factorised easily, in order to solve them.  Sometimes they cannot be factorised, but when that happens, they can always still be solved by the method of ‘completing the square’ to solve a quadratic formula.  This involves rewriting the equation in the form:

### Where p = ½b and q = c – ¼b2

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