Charles II or Charles John Amadeus (Carlo Giovanni Amedeo in Italian) b.1489-d.1496, was the Duke of Savoy from 1490 to 1496 but his mother Blanche of Montferrato[?] was the actual ruler as a regent.
... qualitatively different cases:
If the discriminant is zero, then there is a repeated solution x, and this solution is real. (Geometrically, this means that the ...