A quadratic equation ax2 + bx + c = 0 has the solutions
x = [-b +/- sqrt(b2 - 4*a*c)]/(2*a)
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They are the solutions for the reduced quadratic.
Rational.
None, if the coefficients of the quadratic are in their lowest form.
Not all rational equations have a single solution but can have more than one because of having polynomials. All rational equations do have solutions that cannot fulfill the answer.
The discriminant must be a perfect square or a square of a rational number.