Question 407312
Notice how 54 does NOT go into 5 (54 doesn't end with a 0 or a 5). So 5 is NOT part of the GCF. 



Instead, the GCF of 54x^3, -30x^2 and 15x is actually 3x since this is the largest expression that goes into each term evenly. Notice how the GCF of 54, -30 and 15 is 3 and the GCF of x^3, x^2 and x is x. 



So Andrew should have gotten 3x(18x^2-10x+5), which checks when you redistribute it. 



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