SOLUTION: Factor x²-x-a-a² completely. The answer is (x+a)(x-a-1) But I don't get how to solve it... HELP

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Question 389990: Factor x²-x-a-a² completely.
The answer is (x+a)(x-a-1)
But I don't get how to solve it...
HELP
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
rearranging ___ (x^2 - a^2) - x - a

factoring (difference of squares) ___ [(x + a)(x - a)] - 1(x + a)

consolidating ___ (x - a - 1)(x + a)