What cubed is 27?
Answer; 3 cubed is 27, written 

What cubed is ?
Don't know? Then break it down.
8 is 2 cubed and  is t cubed.

So write it this way



Now the first part of the factorization is to write
the above down without the exponents:



But take away the two inner parentheses and just make it



The other parentheses will contain three terms, gotten this way:

Term 1:  Square the 3, get 9
Term 2:  Multiply the 3 by the 2t, getting 6t and change the sign, getting -6t
Term 3:  Square the (2t) getting 

So the final factored form is:



Edwin