1/2a^2+4a-4,1/2a^2-4a,1/2a^2+41/2a^2+4a-4+(1/2a^2-4a)=1/2a^2+4a-4+1/2a^2-4a=a²-4=(a+2)(a-2)1/2a^2+4a-4+(1/2a^2+4)=1/2a^2+4a-4+1/2a^2+4=a²+4a=a(a+4)1/2a^2-4a+(1/2a^2+4)=1/2a^2-4a+1/2a^2+4=a&#...