Answers: 1
![4n^2+4n-8=4\cdot n^2+4\cdot n-4\cdot2=4(n^2+n-2)\\\\=4(n^2+2n-n-2)=4(n\cdot n+2\cdot n-1\cdot n-1\cdot 2)\\\\=4[n(n+2)-1(n+2)]=\huge\boxed{4(n+2)(n-1)}](/tpl/images/0760/4467/863af.png)
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