Evaluate : (7x + 15y) (5x − 4y) - Mathematics

Evaluate : (7x + 15y) (5x − 4y)

Sum

(7x + 15y) (5x − 4y)

= 7x (5x − 4y) + 15y (5x − 4y)

= 35x² − 28xy + 75xy − 60y²

= 35x² + 47xy − 60y²

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Product of Sum and Difference of Two Terms

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Chapter 12: Identities - Exercise 12 (A) [Page 150]

Chapter 12 Identities
Exercise 12 (A) | Q 5.08 | Page 150

Evaluate : (a+1) (a-1) (a²+1)

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Evaluate: (a + bc) (a − bc) (a² + b²c²)