Q.

Equation of the line joining the foci of the parabolas y2=4xand  x2=−4y

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a

x+y−1=0

b

x−y−1=0

c

x−y+1=0

d

x+y+1=0

answer is B.

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Detailed Solution

Foci of the parabolas are (1, 0) and (0, – 1) and the equation of the line joining them is  y=x−1 or x−y−1=0
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Equation of the line joining the foci of the parabolas y2=4xand  x2=−4y