Caballo is an island in the entrance to the Philippines' Manila Bay. Caballo, along with the larger Corregidor (2 km to the north), separates the harbor entrance into a northern and southern channel. It is doubtful that Caballo measures even 5 km² in area.
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If the discriminant is positive, then there are two different solutions x, both of which are real. (Geometrically, this means that the ...