Question

Ab a chord of the parabola y^2=4ax with vertex at
a. Bc is drawn to be perpebdicular to ab meeting the axis at c the projection of bc on the x axis is

Answer 1

Answer:

Let coordinates of B be (x, y) In  ΔABD, tan θ= BD/AD = y/x In  ΔBCD, tan  (90 - θ) =  BD/DC ∴ DC = y.y/x = 4ax/x = 4a

Answer 2

Answer:∴8x+5x2+3x4=112.50

32x+10x+3x4=11250100

45x4=2252x = 10