1.

The equation of a hyperbola, whose foci are (5, 0) and (?5, 0) and the length of whose conjugate axis is 8, is

A.            \[9{{x}^{2}}-16{{y}^{2}}=144\] 
B.            \[16{{x}^{2}}-9{{y}^{2}}=144\]
C.            \[9{{x}^{2}}+16{{y}^{2}}=144\] 
D.            \[16{{x}^{2}}-9{{y}^{2}}=12\]
Answer» C.            \[9{{x}^{2}}+16{{y}^{2}}=144\] 


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