Positive Definite Quadratic Form

A quadratic form a*xx + b*xy + c*yy is positive definite if it is greater than zero for all values of x and y, not both zero.

Examples:

6xx - 10xy + 15yy is positive definite since 6xx - 10xy + 15yy is equal to ((12x - 10y)^2 + 260y^2) / 24.
6xx - 10xy - 15yy is not positive definite since it equals to -15 when x = 0 and y = 1.

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