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Expand : (2a – 5b – 4c)2 - Mathematics

Sum

Expand : (2a – 5b – 4c)2

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Solution

(2a – 5b – 4c)2

= (2a)2 + (–5b)2 + (–4c)2 + 2 (2a) (–5b) + 2 (–5b) (–4c) + 2 (–4c) (2a)

= 4a2 + 25b2 + 16c2 – 20ab + 40bc – 16ca

Concept: Important Formula of Expansion
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APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 12 Identities
Exercise 12 (D) | Q 9.2 | Page 155
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