MCQ
What should be subtracted from $x^{2}+y^{2}-2 x y$ to get $x^{2}+y^{2} ?$
- A$2 x y$
- ✓$-2 x y$
- C$x y$
- D$-x y$
✓
Answer
Correct option: B.
$-2 x y$
$x^{2}+y^{2}-2 x y-\left(x^{2}+y^{2}\right)=-2 x y$
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