Question

Find the value of
(x + y)2 - {x2+y2 + 2xy), if x=1, y = -1​

Answer 1

( x + y ) 2 - ( x² + y² + 2xy )

After adding the value

( 1 + -1 ) 2 - ( 1² + (-1)² + 2 × 1 × (-1)

2 - 2 - 1 + 1 - 2

-2

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