3. A U B = { -2; -1; 0 }
A * B = { -4; -3; -2; -1; 0; 1; 2; 3; 4; 5; 6}
4.
[tex]8x - 6 = 2(3x - 1) \\ 8x - 6 = 6x - 2 \\ 8x - 6x = 6 - 2 \\ 2x = 4 \\ x = 4 \div 2 \\ x = 2[/tex]
5.
[tex](x - 3) {}^{2} + 4(2x + 1) = (x - 4)(x + 4) - 7 \\ x {}^{2} - 6x + 9 + 8x + 4 = x {}^{2} - 4 {}^{2} - 7 \\ x {}^{2} + 2x + 13 = x {}^{2} - 16 - 7 \\ x {}^{2} + 2x - x {}^{2} = - 13 - 16 - 7 \\ 2x = - 36 \\ x = - 36 \div 2 \\ x = - 18[/tex]
