[tex]\displaystyle 1)-a^2+8ab-16b^2=-(a^2-8ab+16b^2)=-(a-4b)^2\\\\2)-12x^3+12x^2-3x=-3x(4x^2-4x+1)=-3x(2x-1)^2[/tex]
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[tex]\displaystyle 1)-a^2+8ab-16b^2=-(a^2-8ab+16b^2)=-(a-4b)^2\\\\2)-12x^3+12x^2-3x=-3x(4x^2-4x+1)=-3x(2x-1)^2[/tex]