[Jessweeee♪]

Maybe I did something wrong, but I got:

3(3x - 4)(9x² + 12x +16)

I was just told that the signs go SAME OPPOSITE PLUS, though I can't remember for the life of me why


For future reference:

 makes the text superscript, and  makes it subscript. It makes things much clearer in math threads n.n



EDIT:

and rubah's explanation is wrong (I think), the problem has three roots to it!


EDIT 2:

It comes down to

3=0 <--- False. Three does NOT equal zero!
x= 4/3
x= (-2 ± 2isqrt3) / (3)


...but I always make weird mistakes like adding a four instead of a six, so don't use my answers xD