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Question 10 • AZ-Common Core Algebra II A
Recognize x⁶ − 9 as a difference of squares: x⁶ = (x³)² and 9 = 3². Apply a² − b² = (a + b)(a − b) to get (x³ + 3)(x³ − 3), which is choice D.
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Sum and Difference of Two Cubes
Synthetic Division and the Remainder Theorem