By inspection, you will find a the GCF. The coefficient of the third term is -1, and the first term does not contain b, so numbers and b are not part of the GCF.
Divide each term by the GCF to get the factors:
2a² - 4ab² -ab
= a(2a-4b² -b)
Factor each polynomial by factoring out the GCF.
2a^2 - 4ab^2 -ab
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