cwrw238

Question from uk math challenge:
How many distinct pairs (x,y) of real numbers satisfy the equation (x + y)^2 = (x + 4)(x - 4)
A 0 B 1 C 2 D 3 E 4
I think its B.

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cwrw238

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ooopps - sorry my error
its (x + y)^2 = (x + 4)(y - 4)

mukushla

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u think right

cwrw238

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oh - i've assumed they mean real integers

cwrw238

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-4 and 4 right?

mukushla

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right

cwrw238

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thanks

mukushla

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np