Equation of a common tangent to the parabola y2 = 4x and the hyperbola

1.	Equation of a common tangent to the parabola y2 = 4x and the hyperbola xy = 2 is:
A.	x + y + 1 = 0
B.	x – 2y + 4 = 0
C.	x + 2y + 4 = 0
D.	4x + 2y + 1 = 0
Answer» D. 4x + 2y + 1 = 0

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Equation of a common tangent to the parabola y2 = 4x and the hyperbola xy = 2 is:

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