Posted by Ashlynn on Sunday, January 13, 2008 at 6:22pm.
The second one is the sum of perfect cubes, for which you have a formula.
The third is the difference of perfect cubes, same formula almost.
The first I assume is 8x^3+2x^2-12x-3=0 This is not going to factor nicely, I suggest you graph it on your calculator, and take a look at the roots. Not a nice function.
I don't have a graphing calculator. Is there another way to find the roots so I can factor the problem? And I'm sorry I don't know what formula you are talking about for 1 and 2.
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