Factoring Problem: Converting [-s(s-(s-1)-2s+n(n+1)] to (n-s)(n+s+1)

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danny12345
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how do you convert this
[-s(s-(s-1)-2s+n(n+1)]
into (n-s)(n+s+1)
 
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You have some mis-matched parentheses (3 left, but only 2 right). Re-check what you have posted.
 

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