Q.

Shortest distance between the two parabolas y2 = x – 2, x2 = y – 2 is

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a

672

b

142

c

542

d

722

answer is C.

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Detailed Solution

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Given parabolas y2=x2(i),x2=y2(ii) are symmetrical about the line y=xslope of the tangent parallel to y=x is 12ydydx=1y=12from (i) x=94P(x,y)=(12,94)Point on second parabola=(94,12) PQ=722

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Shortest distance between the two parabolas y2 = x – 2, x2 = y – 2 is