[tex]m^2-a^2-8m+16=m^2-(a^2+8m+16)=m^2-(a+4)^2=(m-a-4)(m+a+4)[/tex]
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[tex]m^2-a^2-8m+16=m^2-(a^2+8m+16)=m^2-(a+4)^2=(m-a-4)(m+a+4)[/tex]