Question

Factorise: ( 2a + 1 )^3 + ( a – 1 )^3

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Answer 1

Step-by-step explanation:

3a−21)(3a−21)=(3a−21)2

using identity (a−b)2=a2−2ab+b2

(3a−21)2=(3a)2−2×3a×21+(21)2

(3a−21)2=9a2−3a+41