Q.

If the line y=2x-82 is normal to the parabola y2=8x then its length is _____

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a

43

b

23

c

123

d

163

answer is C.

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Detailed Solution

Given normal y=2x-82 (1),  and parabola   y2=8x(2) where m=2, solving (1) & (2) 2x2+128-32x=8x 2x2-40x+128=0 x2-20x+64=0 (x-16)x-4=0 x=16 or x=4 let two roots be x1=16,x2=4 Now Length of the normal chord = x1-x21+m2                                                   =123

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