# What did the student do wrong? ¢ Solve the problem correctly. Sec. 12.5 #86 Simplify: 12c2 d  2cd + 8cd2  (-c2 d + 4cd)  (

PART B A student submitted the following problem but the solution is incorrect. • Identify the mistake. What did the student do wrong? • Solve the problem correctly. Sec. 12.5 #86 Simplify: 12c2 d – 2cd + 8cd2 – (-c2 d + 4cd) – (5cd – 2cd2 ) Incorrect solution: 12c2 d – 2cd + 8cd2 – (-c2 d + 4cd) – (5cd – 2cd2 ) 12c2 d – 2cd + 8cd2 – c2 d + 4cd – 5cd – 2cd2 12c2 d + 6cd2 –c2 d – 3cd

Part A section 12.6 problem number 64. (8w^2 – X ) (8w^2 + X)

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