الاثنين، 1 أبريل 2013

Quadratic factorization

The term
x - r\,
is a factor of the polynomial
ax^2+bx+c, \
if and only if r is a root of the quadratic equation
ax^2+bx+c=0. \
It follows from the quadratic formula that
ax^2+bx+c = a \left( x - \frac{-b + \sqrt {b^2-4ac}}{2a} \right) \left( x - \frac{-b - \sqrt {b^2-4ac}}{2a} \right).
In the special case (b^2 = 4ac) where the quadratic has only one distinct root (i.e. the discriminant is zero), the quadratic polynomial can be factored as
ax^2+bx+c = a \left( x + \frac{b}{2a} \right)^2.\,\!

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