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Find the Cube Of: 2a − 1 - Mathematics

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Question

Find the cube of: 2a − 1

Sum

Solution

(2a − 1)3 = (2a)3 − (1)3 − 3×2a×1(2a − 1)

= 8a3 − 1 − 6a (2a − 1)

= 8a3 − 1 − 12a2 + 6a

= 8a3 − 12a2 + 6a − 1

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Cubes of Binomials
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Q 5.2
Chapter 12: Identities - Exercise 12 (B) [Page 152]

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Selina Concise Mathematics [English] Class 8 ICSE
Chapter 12 Identities
Exercise 12 (B) | Q 5.2 | Page 152

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