Mathematics: If (x-y)^2-(x+y)^2=-20, determine the value of xy

If (x-y)^2-(x+y)^2=-20, determine the value of

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nextgen32

05.01.2022

Mathematics

$(x-y)^2-(x+y)^2=-20\\
x^2-2xy+y^2-(x^2+2xy+y^2)=-20\\
x^2-2xy+y^2-x^2-2xy-y^2=-20\\
-4xy=-20\\
xy=5$

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Ответ:

ronaa

09.02.2022

Mathematics

They were a great trading nation, they also have their own alphabet. Hope this helps!! :D

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