[tex]D = 2x(3x+1)-8x[/tex]
[tex]D=6x^{2} +2x-8x[/tex]
[tex]D=6x^{2} -6x[/tex]
[tex]E=(4x-5)(2x+1)+(4x-5)(-3x+9)[/tex]
[tex]E=(4x-5)(2x+1-3x+9)[/tex]
[tex]E=(4x-5)(-x+10)[/tex]
[tex]F = (-2x-3)(5x-1)-(-2x-3)^{2}[/tex]
[tex]F = (-2x-3)(5x-1(-2x-3))[/tex]
[tex]F = (-2x-3)(7x-1+3)[/tex]
[tex]F = (-2x-3)(7x+2)[/tex]