[tex]1. \\(a-b)^2-2(a+b)(a-b)=\\a^2-2ab+b^2-2(a^2-b^2)=\\a^2-2ab+b^2-2a^2+2b^2=\\-a^2-2ab+3b^2=3b^2-2ab-a^2\\Odp. D[/tex]
[tex]2. \\(3-2x)^2=ax^2+bx+c\\9-12x+4x^2=ax^2+bx+c\\4x^2-12x+9=ax^2+bx+c\\4x^2=ax^2\\a=4\\\\-12x=bx\\b=12\\\\c=9[/tex]
[tex]3. \\\\(2a-3b)^2+(b-2a)(b+2a)-3b(b+2a)=\\4a^2-12ab+9b^2+b^2-4a^2-3b^2-6ab=\\-18ab+7b^2=7b^2-18ab[/tex]
[tex]4. \\\\(x-4y)^2-(3x+y)^2=\\x^2-8xy+16y^2-(9x^2+6xy+y^2)=\\x^2-8xy+16y^2-9x^2-6xy-y^2=\\-8x^2-14xy+15y^2=15y^2-14xy-8x^2[/tex]
