bonjour
E = ( x + 1 )² - ( x- 1 )²
E = ( x + 1 + x - 1 ) ( x + 1 - x + 1 )
E = 2 x ( 2)
E = 4 x
5 01² - 4 99² = ( 500 + 1 ) - ( 500 - 1 )
= ( 500 + 1 + 500 - 1 ) ( 500 + 1 - 500 + 1 )
= 1000 ( 2 ) = 2 000
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bonjour
E = ( x + 1 )² - ( x- 1 )²
E = ( x + 1 + x - 1 ) ( x + 1 - x + 1 )
E = 2 x ( 2)
E = 4 x
5 01² - 4 99² = ( 500 + 1 ) - ( 500 - 1 )
= ( 500 + 1 + 500 - 1 ) ( 500 + 1 - 500 + 1 )
= 1000 ( 2 ) = 2 000