If a- 2b +3c =0 prove that a³ -8b³+ 27c²= - 18abc
2 answers:
Answer:
<u>Use the identity:</u>
- x³ + y³ + z³ = 3xyz if x + y + z = 0
<u>Substitute:</u>
<u>to get</u>
- a³ + (-2b)³ + (3c)³ = 3a(-2b)(3c)
- a³ - 8b³ + 27c³ = --18abc
Step-by-step explanation:
the answer is in the photo as attached
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