1.

Find the length of the latus rectum of the parabola y2 = 4ax passing through the point (2, -6).

Answer»

Given equation of the parabola is y2 = 4ax and it passes through point (2, -6). 

Substituting x = 2 and y = -6 in y2 = 4ax, we get 

⇒ (-6)2 = 4a(2) 

⇒ 4a = 18 

∴ Length of latus rectum = 4a = 18 units



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