SOLUTION: hello, I am having a problem figuring out how to apply this formula A3 + B3= (A+B) (A2-A+B + B2) 64x3 - 27 = the answer is 8x3 - 125 = (2x-5) (4x2 + 10x +25) my answer th

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: hello, I am having a problem figuring out how to apply this formula A3 + B3= (A+B) (A2-A+B + B2) 64x3 - 27 = the answer is 8x3 - 125 = (2x-5) (4x2 + 10x +25) my answer th      Log On


   

Question 1094987: hello, I am having a problem figuring out how to apply this formula
A3 + B3= (A+B) (A2-A+B + B2)
64x3 - 27 =
the answer is 8x3 - 125 = (2x-5) (4x2 + 10x +25)
my answer that is incorrect was 9x3 - 125 = (2x-5) (4x2 + 6x + 15) can you please tell me what I am dong wrong?
Answer by ikleyn(52909) About Me  (Show Source):
You can put this solution on YOUR website!
.
The formula written in your post is INCORRECT.


The correct formula/(formulas) is/(are) THIS/(THESE):


      A%5E3+%2B+B%5E3 = %28A%2BB%29%2A%28A%5E2+-+AB+%2B+B%5E2%29,


      A%5E3+-+B%5E3 = %28A-B%29%2A%28A%5E2+%2B+AB+%2B+B%5E2%29.