Posted by **Chopsticks** on Wednesday, January 7, 2009 at 11:53pm.

Ok heres another factoring that I need someone to check

Problem: -x^3 + 27

-(x^3 - 3^3)

So I moved the positive and found out what cubed would make 27

Using the forumla: (a-b)(a^2+ab+b^2)

-(x-3) (x^2 + 3x + 9)

Right? Or did I make a mistake?

- Math -
**sh**, Thursday, January 8, 2009 at 12:09am
That is correct, you can always double check your answer by expanding it

-(x^3+3x^2+9x-3x^2-9x-27)

cancel the ones you need to cancel and you get

-(x^3-27)

=-x^3+27

- Math -
**Chopsticks**, Thursday, January 8, 2009 at 12:13am
So I factored it right? Ha thanks alot.

## Answer this Question

## Related Questions

- Alg 2 - Ok heres another factoring that I need someone to check Problem: -x^3 + ...
- statistics - Hey. I am having problem with stem leaf plot diagram. Heres the ...
- factoring cubes - how to factor x^3-27 well since 27 is a perfect cube and so is...
- Algebra - I am having issues with factoring. I am trying to check my work using ...
- algebra - Can someone please check my answer? Rearrange (cp-yd)/(pd)=p+y to make...
- algabra - the sum of a the digits in a two digit # is 11. if the digits are ...
- math - ok so i havent done domain and ranges for a while so i need some help ...
- math,correction - can someone check these for me please.... problem#4 Directions...
- More Math 2 See If You Can Help Me... :) - Problem: a^2-9 a^2-3a...
- math,correction please.. - (x)/(x-2) - (x+1)/(x) = (8)/(x^2-2x) I keep getting x...