(-m+n)²-m(2m-n)?

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(-m+n)²-m(2m-n)?
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(-m+n)²-m(2m-n)?
(-m+n)²-m(2m-n)?

(-m+n)²-m(2m-n)?
(-m+n)²-m(2m-n)
=m²-2mn+n²-2m²+mn
=-m²-mn+n²

=m²+n²-2mn-2m²+mn
= -m²+n²-mn
=n²-m²-mn