Question

100 (x + y) whole square - 81 (a + b )whole square

Answer 1

$100 \times x \: + \: 100 \times y - 81 \times a + 81 \times b =$

Answer 2

Hello Mate!

Since we know that,

a² - b² = ( a + b )( a - b )

Since, 100 = 10² and 81 = 9²

= 100( x + y )² - 81( a + b )²

= 10²( x + y )² - 9²( a + b )

= [10( x + y )]² - [9( a + b )]²

= [10(x + y) - 9(a + b)][ 10(x + y) + 9(a + b)]

Have great future ahead!