[tex]\displaystyle\bf\\1)\\\\(a+4)^{2} =a^{2} +2\cdot a\cdot 2+2^{2} =a^{2} +4a+4\\\\2)\\\\(8-a)(8+a)=8^{2} -a^{2} =64-a^{2} \\\\3)\\\\(x-3)(x^{2} +3x+9)=x^{3} -3^{3} =x^{3} -27[/tex]
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[tex]\displaystyle\bf\\1)\\\\(a+4)^{2} =a^{2} +2\cdot a\cdot 2+2^{2} =a^{2} +4a+4\\\\2)\\\\(8-a)(8+a)=8^{2} -a^{2} =64-a^{2} \\\\3)\\\\(x-3)(x^{2} +3x+9)=x^{3} -3^{3} =x^{3} -27[/tex]