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a•(a+2)-a•(a-2)=
Va rog urgent!!!!!


Răspuns :

a•(a+2)-a•(a-2)=a²+2a-a²+2a=4a
   
[tex]a(a+2) - a(a-2) = \\ \\ =a[a+2 -(a-2) ] = a[a+2-a+2] = a(2+2) =\boxed{4a}[/tex]