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Find the Cube Of: 3b − 2a - Mathematics

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Question

Find the cube of: 3b − 2a

Sum

Solution

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

= 27b3 − 8a3 − 18ab (3b − 2a)

= 27b3 − 8a3 − 54ab2 + 36a2b

= 27b3 − 54b2a + 36ba2 − 8a3

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Cubes of Binomials
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Q 5.4
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 5.4 | Page 152

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