SOLUTION: Can you help me wtih this problem? Factor by grouping: 1-n-m+nm

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Question 181773: Can you help me wtih this problem? Factor by grouping: 1-n-m+nm
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Factor by grouping:
1-n-m%2Bnm Group as shown, and remember to change the sign (+ to -) in the last term:
%281-n%29+-+%28m-n%2Am%29 Factor the m in the second group.
%281-n%29-+m%281-n%29 Now factor the (1-n)
highlight%28%281-n%29%281-m%29%29...and you're done!