(2a +1)³+ (a – 1)³ factorise
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Step-by-step explanation:
(2a+1)^3(a-1)^3
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Answer:
9a(a² + a + 1)
Step-by-step explanation:
Formulae:
(a + b)³ = a³ + b³ + 3a²b + 3ab²
(a - b)³ = a³ - b³ - 3a²b + 3ab²
(2a + 1)³ + (a - 1)³
= 8a³ + 1 + 12a² + 6a + a³ - 1 - 3a² + 3a
= 9a³ + 9a² + 9a
= 9a(a² + a + 1)
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