Which is the equation of a hyperbola centered at the origin with focus -3,0) and vertex -2,0)?
a x2
cx Y.
6
= 1
B. 21.1
d _

Rhombus adef is inscribed into a triangle abc so that they share angle a and the vertex e lies on the side bc . what is the length of the side of the rhombus if ab=c, and ac=b.