1.

The equation of the parabola having (2, 4) and (2, -4) as end points of its latus rectum is ________ (A) y2 = 4x (B) y2 = 8x (C) y2 = -16x (D) x2 = 8y

Answer»

Correct option is: (B) y2 = 8x

The given points lie in the 1st and 4th quadrants. 

∴ Equation of the parabola is y2 = 4ax 

End points of latus rectum are (a, 2a) and (a, -2a) 

∴ a = 2 

∴ required equation of parabola is y2 = 8x



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