Question 9 • Common Core Algebra I B-IC
Distribute each term in y − 3 across y² + 3y + 9. The product is y³ + 3y² + 9y − 3y² − 9y − 27. Comparing this with y³ + 3y² + ay − 3y² − ay − 27 shows that a = 9, so the correct choice is 9.
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