# CKEDITOR 4 on PHP

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In elementary algebra, the quadratic formula is the solution of the quadratic equation.

$x=\frac{-b±\sqrt{{b}^{2}-4ac}}{2a}$

Each of the solutions given by the quadratic formula is called a root of the quadratic equation.

The general quadratic equation is: $a{x}^{2}+bx+c=0$

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