bonjour
f (x) = ( x + 1 )² - 1
f (x) = ( x + 1 - 1 ) ( x + 1 + 1 )
f (x) = x ( x + 2 )
f ( - 4 ) = - 4 ( - 4 + 2) = - 4 * - 2 = 8
f ( - 3 ) = - 3 ( - 3+ 2 ) = - 3 * - 1 = 3
f ( - 2 ) = - 2 ( - 2 + 2 ) = 0
f ( - 1 ) = - 1 ( - 1 + 2 ) = - 1 * 1 = - 1
f (0) = 0
f ( 1 ) = 1 * 3 = 3
f ( 2) = 2 *4 = 8
f ( 3) = 2 * 5 = 10
f ( 4 ) = 2 * 6 = 12
