Question

Упростите выражение
-(2 + m)² + 2(1 + m)² - 2(1 - m)(m + 1)

Answer 1

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Answer 2

$-(2+m)^2+2(1+m)^2-2(1-m)(m+1)=-(4+4m+m^2)+2(1+ \ 2m+m^2)-2(1-m)(m+1)=-(4+4m+m^2)+2+4m+2m^2- \ 2(1-m)^2=-4-4m-m^2+2+4m+2m^2-2+2m^2=-4+3m^2$