If the parabolas y2 = 4b(x – c) and y2 = 8ax have a common normal, then which one of the following is a valid choice for the ordered triad (a, b, c)?

\(\left( {\frac{1}{2},2,\;0} \right)\)

\(\left( {\frac{1}{2},2,{\rm{\;}}3} \right)\)

If the parabolas y2 = 4b(x – c) and y2 = 8ax have a common normal, t

1.	If the parabolas y2 = 4b(x – c) and y2 = 8ax have a common normal, then which one of the following is a valid choice for the ordered triad (a, b, c)?
A.	\(\left( {\frac{1}{2},2,{\rm{\;}}3} \right)\)
B.	(1, 1, 3)
C.	\(\left( {\frac{1}{2},2,\;0} \right)\)
D.	(1, 1, 0)
Answer» C. \(\left( {\frac{1}{2},2,\;0} \right)\)

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If the parabolas y2 = 4b(x – c) and y2 = 8ax have a common normal, then which one of the following is a valid choice for the ordered triad (a, b, c)?

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