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 : (2a−b) (2a+b) (4a²+b²)

Evaluate : (3−2x) (3+2x) (9+4x²)

Use the product (a + b) (a – b) = a² – b² to evaluate:
33 x 27

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

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 : `(3"x"-1/(2"y"))(3"x"+1/(2"y"))`

Evaluate : (9a − 7b) (3a − b)

Evaluate: (m + 3) (m − 3) (m² + 9)