Factorise → 8 - 27a³ - 36a + 54a
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Answer:
(a -b)3
Step-by-step explanation:
8 - 27a3 - 36a + 54a2
= (2)3 - (3a)3 - 3(2)2 (3a) + 3(2)2 (3a2)
= (2-3a)3
USING IDENTITY,
a3 - b3 -3a2 + 3ab2 = (a - b) 3
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