Factorise 216a^3 - 27
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Answer:
27 (2a - 1) (4a² + 2a + 1)
Step-by-step explanation:
>> 216a³ - 27
>> (6a)³ - 3³
Using Formula a³ - b³ = (a - b) (a² + ab + b²)
>> (6a - 3) [(6a)² + (6a * 3) + 3²]
>> (6a - 3) (36a² + 18a + 9)
>> 3(2a - 1) 9(4a² + 2a + 1)
>> 3x9 (2a - 1) (4a² + 2a + 1)
>> 27 (2a - 1) (4a² + 2a + 1)
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