. If the segment intercepted by the parabola
y2 = 4ax with the line lx + my + n = 0 subtends a right angle at the vertex, then
A. 4am + n = 0
B. 4am + 4al + n = 0
C.4al + n = 0
D. al + n = 0
Best Answer
Ans: C
Sol: 
now coefficient of x2 + coefficient of y2 = 0 Þ 4al + n = 0
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