Yes ...PRACTISE (I hope the spelling is right)i really have a hard time in factoring long expressions. is there any technique?
You started with
In the above, you multiplied everything out to get:
. . . . .
There appear to be some steps missing between the above and your next step:
I think you regrouped and then factored out of pairs of terms, as:
. . . . .
. . . . .
Then you factored the difference of squares in the last set of parentheses above, and factored " " out front:
. . . . .
. . . . .
. . . . .
You then paired and factored inside the second parentheses:
. . . . .
. . . . .
. . . . .
Then you factored the differences of squares:
. . . . .
This wasn't the factored form I'd expected, but it looks to be correct. Good job!