Question 156666
Your approach is fine.
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However, if the same factor occurs more than once in an expression, you multiply the factor the greatest number of times it occurs. 
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Notice that (w + 5 ) occurs TWICE when factoring w^2+10w+25 
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Therefore, instead of
w^2(w + 5)(w − 5)
it should be:
w^2(w + 5)^2(w − 5)