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1992-09-02
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In mathematics, a polynomial equation of
second degree (that is, an equation
containing as its highest power the square of
a single unknown variable, such as x^2). The
general formula of such equations is ax^2 +
bx + c = 0, in which a, b, and c are real
numbers, and only the coefficient a cannot
equal 0. In coordinate geometry, a quadratic
function represents a parabola. Depending on
the value of the discriminant b^2 - 4ac, a
quadratic equation has two real, two equal or
two complex roots (solutions). When b^2 - 4ac
> 0, there are two distinct real roots. When
b^2 - 4ac = 0, there are two equal real
roots. When b^2 - 4ac < 0, there are two
distinct complex roots. Some quadratic
equations can be solved by factorization, or
the values of x can be found by using the
formula for the general solution x = [-b `+-'
`sqrt'(b ^2 - 4ac)]/2a.