Evaluate : (5x + 8y) (3x + 5y)

Evaluate : (5x + 8y) (3x + 5y)

Sum

(5x + 8y) (3x + 5y)

= 5x (3x + 5y) + 8y (3x+ 5y)

= 15x² + 25xy + 24xy + 40y²

= 15x² + 49xy + 40y²

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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 5.07 | Page 150

Evaluate : (a+b) (a−b) (a²+b²)

Evaluate : (3−2x) (3+2x) (9+4x²)

Evaluate : (3x−4y) (3x+4y) (9x²+16y²)

Use the product (a + b) (a – b) = a² – b² to evaluate:
21 x 19

Use the product (a + b) (a – b) = a² – b² to evaluate:
7.7 x 8.3

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

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

Evaluate: (a² + 5) (a² − 3)

Evaluate: (4x² − 5y²) (4x² + 5y²)

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