Question 204105
3c^3 +6c^2 -27c -54
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Grouping  first
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3c^2 (c+2) - 27 ( c+2),,,,,ab -cb= (a-c)(b)
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(3c^2 -27)(c+2)
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3(c^2 -9) (c+2)
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3(c+3)(c-3)(c+2)
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check, let  c=1,,,both original  and  answer  = -72,,,,ok