1/2a^2+4a-4,1/2a^2-4a,1/2a^2+4
1/2a^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
=a²-4a+4
=(a-2)²
1/2a^2+4a-4,1/2a^2-4a,1/2a^2+4
1/2a^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
=a²-4a+4
=(a-2)²