[tex] (3x + 2)^2 + (3x - 2)^2 - 2(9x^2 - 4)[/tex][tex] = (3x^2 + 4x + 4) + (9x^2 - 12x + 4) - 18x^2 + 8[/tex][tex] = 3x^2 + 4x + 4 + 9x^2 - 12x + 4 - 18x^2 + 8[/tex][tex] = 3x^2 + 9x^2 - 18x^2 + 4x - 12x + 4 + 4 + 8[/tex][tex] = -6x^2 - 8x + 16[/tex]
[tex] (3x + 2)^2 + (3x - 2)^2 - 2(9x^2 - 4)[/tex]
[tex] = (3x^2 + 4x + 4) + (9x^2 - 12x + 4) - 18x^2 + 8[/tex]
[tex] = 3x^2 + 4x + 4 + 9x^2 - 12x + 4 - 18x^2 + 8[/tex]
[tex] = 3x^2 + 9x^2 - 18x^2 + 4x - 12x + 4 + 4 + 8[/tex]
[tex] = -6x^2 - 8x + 16[/tex]