Evaluate : (7x + 15y) (5x − 4y)

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)

Evaluate : (a+b) (a−b) (a²+b²)

Evaluate : (3−2x) (3+2x) (9+4x²)

Use the product (a + b) (a – b) = a² – b² to evaluate:
103 x 97

Use the product (a + b) (a – b) = a² – b² to evaluate:
4.6 x 5.4

Evaluate : `(7"x"+2/3"y")(7"x"-2/3"y")`

Evaluate : `("a"/(2"b")+(2"b")/"a")("a"/(2"b")-(2"b")/"a")`

Evaluate : (9a − 7b) (3a − b)

Evaluate: (a² + 5) (a² − 3)

Evaluate: (m + 3) (m − 3) (m² + 9)