4. What are the factors a³ – b³?
A. (a – b) (a² + ab + b²)
B. (a – b) (a²- ab + b²)
C. (a + b) (a²- ab + b²)
D. (a + b) (a² + ab + b²)
5. What are the factors of 1 + 8k³?
A. (1-2k) (1-2k + 4k²)
B. (1-2k) (1 + 2k + 4k²)
C. (1+2k) (1-2k + 4k²)
D. (1+2k) (1 + 2k + 4k²)
Answer:
4. A. (a−b)(a² + ab + b²)
5. C. (1+2K) (1-2 + 4k²)
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