bonjour
2 x 4 - 3 ²
= 8 - 9 = - 1
7 x 9 - 8 ² = 63 - 64 = - 1
15 x 17 - 16 ² = 255 - 256 = - 1
( x - 1 ) ( x + 1) - x²
= x² - 1 - x²
= - 1
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bonjour
2 x 4 - 3 ²
= 8 - 9 = - 1
7 x 9 - 8 ² = 63 - 64 = - 1
15 x 17 - 16 ² = 255 - 256 = - 1
( x - 1 ) ( x + 1) - x²
= x² - 1 - x²
= - 1