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Expand : (3x − 2y)3 - Mathematics

Sum

Expand : (3x − 2y)3

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Solution

(3x − 2y)2 = (3x)3 − (2y)3 − 3 × 3x × 2y (3x − 2y)

= 27x3 − 8y3 − 18xy (3x − 2y)

= 27x3 − 8y3 − 54x2y + 36xy2

Concept: Cubes of Binomials
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APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 12 Identities
Exercise 12 (B) | Q 4.3 | Page 152
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