Question

упростите выражение ​

Answer 1

1) (а+b)^2-(a-b)^2=2b*2a=4ab
2 (m+4)^2-4(m+1)^2=m^2+8m+16-4(m^2+2m+1)=m^2+8m+16-4m^2-8m-4=-3m^2+12
3)3(2-y)^2+4(y-5)^2=3(4-4y+y^2)+4(y^2-10y+25)=12-12y+3y^2+4y^2-40y+100=112-52y+7y^2=7y^2-52y+112