Mathematics, 19.04.2021 23:38 thasen31

Adam solved this problem. His teacher said it was incorrect. Find his error and correct it. (a − 3)(5a3 − a2 + 2a − 7) = (a)(5a3 − a2 + 2a − 7) − (3)(5a3 − a2 + 2a − 7) = 5a4 − a3 + 2a2 − 7a − 15a3 + 3a2 + 6a − 21 = 5a4 − 16a3 + 5a2 − a − 21

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