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Aaron G. | Aaron - exceptional at Math and anything business-relatedAaron - exceptional at Math and anything...
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Set both factors equal to 0 and solve. 

n+1 = 0, n = -1

n+9 = 0, n = -9

n= -1, -9

Christopher K. | Math tutor for all grades and early college.Math tutor for all grades and early coll...

The question is asking, For what values of n will the equation equal zero. So you can break it apart and set each set of parenthesis equal to zero then solve for n. => n+1=0 , n+9=0 so the values of n that make the equation zero are -1 and -9.