Evaluate : (9a − 7b) (3a − B)

Evaluate : (9a − 7b) (3a − b)

Sum

(9a − 7b) (3a − b)

= 9a (3a − b) − 7b (3a − b)

= 27a² − 9ab − 21ab + 7b²

= 27a² − 30ab + 7b²

shaalaa.com

Product of Sum and Difference of Two Terms

Is there an error in this question or solution?

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

Chapter 12 Identities
Exercise 12 (A) | Q 5.1 | Page 150

Evaluate : (a+1) (a-1) (a²+1)

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: (2a + 3) (2a − 3) (4a² + 9)

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

Evaluate: (a² + 5) (a² − 3)

Evaluate: (3a² − 4b²) (8a² − 3b²)

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