Question

What should be subtracted from x2 + y2 – 2xy to get x2 + y2?

Answer 1

Answer:

-2xy

Step-by-step explanation:

Because, x2 + y2 – 2xy - - 2xy = x2 + y2 – 2xy + 2xy =  x2 + y2.

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Answer 2

Answer: $2xy$

Step-by-step explanation: Subtract $x^{2} +y^{2} - 2xy$ from $x^{2} + y^{2}$

$x^{2} +y^{2} - (x^{2} +y^{2} - 2xy)$

$=2xy$  

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