# Chapter 6 - Section 6.5 - Factoring by Special Products - Exercise Set: 21

m$(m+9)^{2}$

#### Work Step by Step

$m^{3}$+18$m^{2}$+81m=m($m^{2}$+18m+81)= m($m^{2}$+2*m*9)+$9^{2}$)=m($(m+9)^{2}$

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