Find the values of the following expressions:
(i) 
(ii) 
(iii) 
(i) 
(4x)2 + 2 (4x) (3) + 32
= (4x + 3)2
Putting x = 
= [4 (
) + 3]2
= (7 + 3)2
= 100
(ii) 
(8x)2 + 2 (8x) (9y) + (9y)2
= (8x + 9y)2
Putting x = 11 and y = 
= [8 (11) + 9 (
)]2
= (88 + 12)2
= (100)2
= 10000
(iii) 
(9x)2 + (4y)2 – 2 (9x) (4y)
= (9x – 4y)2
Putting x = 
and y = 
= [9 (
) – 4 (
)]2
= (6 – 3)2
= 32
= 9
13