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Evaluate: (5xy − 7) (7xy + 9) - Mathematics

Sum

Evaluate: (5xy − 7) (7xy + 9) 

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Solution

(5xy − 7) (7xy + 9) = 5xy (7xy + 9) − 7 (7xy + 9)

= 35x2y2 + 45xy − 49xy − 63

= 35x2y2 − 4xy − 63

Concept: Algebraic Identities
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APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 12 Identities
Exercise 12 (D) | Q 1.7 | Page 155
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