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QuizMultiple Choice

Factoring Polynomials: Double Grouping — Unit test

Question 1 • Common Core Algebra I B-IC

Which is a sum of cubes?

Answer
A
a3 + 18
B
a6 + 9
C
a9 + 16
D
a12 + 8

Explanation

A sum of cubes has two terms that are each perfect cubes. In choice D, a¹² = (a⁴)³ and 8 = 2³, so a¹² + 8 is a sum of cubes.

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