Question

I posted this earlier in the day but no one answered. Can anyone help with these problems?
Factor completely:
1. 8x3 + 2x3 – 12x –3
2. 27x3+8
3.125 – 8x3


bobpursley
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.

Related Questions

I posted this problem earlier and you answered it for me. The teacher said the correct answer is 3+2... I posted a few questions and then went back and posted how I thought they were supposed to be answe... I posted these questions earlier a lot of times but noone answered them and i really need help so ca...