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Sagot :
Step-by-step explanation:
the answer is in the photo as attached
Answer:
Use the identity:
- x³ + y³ + z³ = 3xyz if x + y + z = 0
Substitute:
- x = a, y = -2b, z = 3c
to get
- a³ + (-2b)³ + (3c)³ = 3a(-2b)(3c)
- a³ - 8b³ + 27c³ = --18abc
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