how do you unfoil trinomials?

Question

can you give me a step by step direction please

Answer 1

(a+B)^3 = a^3+3a^2b+3ab^2+b^3
(a^3+b^3) =(a+b)(a^2-2ab+b^2)
(a^3-b^3) =(a-b)(a^2+2ab+b^2)

That should be all you need.

Answer 2

There are several things one can do. The website below does a good job explaining the possible solutions and steps. Scroll down to page 18, where it says "Taking on three terms" to begin:

http://media.wiley.com/product_data/excerpt/19/04717758/0471775819.pdf

To find others, try doing an on-line search for: unfoiling a trinomial.