Question

(3.5a +4.5b)2 - (3.5a - 4.5b)2



Its using identities

Answer 1

Step-by-step explanation:

(3.5a + 4.5b)² - (3.5a - 4.5b)²

= (3.5a)² + 2 × 3.5a × 4.5b + (4.5b)² - ( 3.5a + 4.5b ) . ( 3.5a- 4.5b ) Answer.

rule > 1. ( a +b )² = a² + 2ab + b²

> 2. ( a - b )² = ( a + b ) . ( a - b )