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Discriminant of the quadratic polynomial

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The discriminant of a polynomial is a function of its coefficients, typically denoted by a capital 'D' or the capital Greek letter Delta (¥Ä).
It gives information about the nature of its roots. Typically, the discriminant is zero if the polynomial has a multiple root.
For example, the discriminant of the quadratic polynomial ax^2+bx+c, is

D = b^2-4ac
a : coefficient of x^2
b : coefficient of x
c : constant

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https://en.wikipedia.org/wiki/Discriminant
D = b^2-4*a*c
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