Evaluate
-\left(x-y\right)^{2}+4
Expand
4-y^{2}+2xy-x^{2}
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4-\left(x^{2}-2xy+y^{2}\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-y\right)^{2}.
4-x^{2}+2xy-y^{2}
To find the opposite of x^{2}-2xy+y^{2}, find the opposite of each term.
4-\left(x^{2}-2xy+y^{2}\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-y\right)^{2}.
4-x^{2}+2xy-y^{2}
To find the opposite of x^{2}-2xy+y^{2}, find the opposite of each term.
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