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Question

Distance between two parallel planes 2x + y + 2z = 8 and 4x + 2y + 4z + 5 = 0 is


A

32

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B

52

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C

72

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D

92

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Solution

The correct option is C

72


Given planes are
2x+y+2z8=0 and 2x+y+2z+52=0 Distance between two planes=|c1c2|a2+b2+c2=85222+12+22=2123=72


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