Find solutions for x2 + ax + b = 0 or ax2 + bx + c = 0 equation where a, b, and c are constants and x is unknown variable.

This functions are available for floating point numbers only.

You can find more information in comments below.

// Find solutions of x * x + ax + b = 0 equation and store them in x1 and x2. Return number of found solutions including complex ones. Return either 1 or 2 
    template<class TYPE>
    typename std::enable_if<std::is_floating_point<TYPE>::value, int>::type
        SolveEquation2n(const TYPE a, const TYPE b, TComplex<TYPE> &x1, TComplex<TYPE> &x2);
    
    // Find solutions of a * x * x + bx + c = 0 equation and store them in x1 and x2. Return number of found solutions including complex ones. Return 0(if both a and b are zero), 1 or 2. Tolerance is used to compare a and b with zero 
    template<class TYPE>
    typename std::enable_if<std::is_floating_point<TYPE>::value, int>::type
        SolveEquation2n(const TYPE a, const TYPE b, const TYPE c, TComplex<TYPE> &x1, TComplex<TYPE> &x2, const TYPE tolerance);