how do i factor 18c^2 - 128?

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the way that you factor 18c^2 -128 is you : list the prime factors of 18c^2 and 128 18c^2:2*3*3*c*c 128: 2*2*2*2*2*2*2 then you circle the to prime factors that are alike on top and bottom which is 2 so your final answer is : 2(9c-64) the way to check your work is you distrbute then you will get the equation that you started with.