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CISCEICSE ICSE Class 8
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Find the Cube Of: 2a + 3b - Mathematics

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Question

Find the cube of: 2a + 3b

Sum

Solution

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

= 8a3 + 27b3 + 18ab (2a + 3b)

= 8a3 + 27b3 + 36a2b + 54ab2

= 8a3 + 36a2b + 54ab2 + 27b3

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Cubes of Binomials
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Q 5.3
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 5.3 | Page 152

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