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Question

Given x + y = 2, then expressing x2-2y-4 in terms of y gives


A

y2-6y-8

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B

y2-6y

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C

y2-6y-2

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D

y2+4y

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Solution

The correct option is B

y2-6y


x=2-y

so x2-2y-4 = (2-y)2-2y-4 = y2-6y


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