الاثنين، 1 أبريل 2013

Quadratic formula

A quadratic equation with real or complex coefficients has two solutions, called roots. These two solutions may or may not be distinct, and they may or may not be real.
Having
ax^2+bx+c=0\,
the roots are given by the quadratic formula[1]
x=\frac{-b \pm \sqrt {b^2-4ac}}{2a}
where the symbol "±" indicates that both
 x=\frac{-b + \sqrt {b^2-4ac}}{2a}\quad\text{and}\quad x=\frac{-b - \sqrt {b^2-4ac}}{2a}


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