(-3a+2b)^2
=9a^2-12ab+4b^2
(a+2b-3c)(a-2b-3c)
=(a-3c+2b)(a-3c-2b)
=(a-3c)^2-(2b)^2
=a^2-6ac+9c^2-4b^2
=a^2-4b^2+9c^2-6ac
(2a+b)^2(2a-b)^2
=(4a^2-b^2)^2
=16a^4-8a^2b^2+b^4
(-3a+2b)^2
=9a^2-12ab+4b^2
(a+2b-3c)(a-2b-3c)
=(a-3c+2b)(a-3c-2b)
=(a-3c)^2-(2b)^2
=a^2-6ac+9c^2-4b^2
=a^2-4b^2+9c^2-6ac
(2a+b)^2(2a-b)^2
=(4a^2-b^2)^2
=16a^4-8a^2b^2+b^4