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![4x^2-28x-32\\\\=4(x^2-7x-8)\\\\=4(x^2-8x+x-8)\\\\=4[x(x-8)+1(x-8)]\\\\=4(x-8)(x+1)\\](/tpl/images/1391/2402/dae1c.png)
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4x2 -28x-32 fully factored...
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