[tex]\displaystyle (a-4)^2-(a-1)(a+1)=a^2-8a+16-(a^2-1)=a^2-8a+16-a^2+1=-8a+17[/tex]
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[tex]\displaystyle (a-4)^2-(a-1)(a+1)=a^2-8a+16-(a^2-1)=a^2-8a+16-a^2+1=-8a+17[/tex]