1.(-2a+3b-c)^2=(3b-(2a+c))^2=9b^2-6b(2a+c)+(2a+c)^2=9b^2-12ab-6bc+4a^2+4ac+c^2=4a^2+9b^2+c^2-12ab-6bc+4ac2.(-3x+2y-z)(3x+2y+z)=(2y-(3x+z))(2y+(3x+z))=4y^2-(3x+z)^2=4y^2-9x^2-6xz-z^2=4y^2-9x^2-z^2-6xz3...