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Mathematics 21 Online
OpenStudy (anonymous):

Simplify 10a2b(a2 − 3a − 4) (A) 10a4b − 30a2b − 4 (B) 10a4b − 30a3b − 40a2b (C) 10a4b − 70a2b (D) 10a4b − 30a3b − 4

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