Find the following products and verify the result for x=-1, y=-2:
(
x)2 – (
)2
= (
x – 
) (
x + 
)
= 
x2 - 
y4
Putting x = -1 and y = -2, we have
(
(-1) – 
) = (
(-1)2 - 
)
= (
- 
) (
+ 
) = (
- 
)
= (
) (
) = 
= 
= 
Therefore,
L.H.S = R.H.S
Hence, verified
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