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bonjour

f (x) = 2 x² - 4

f ( -2) =  2 ( - 2)² - 4 =  4

f ( - √2) = 2 ( - √2)² - 4 = 4 - 4 = 0

f ( - 1 ) = 2 * ( -1 )² - 4 = - 2

f ( 0) = - 4

f ( 1) = 2 *  1² - 4 = - 2

f ( √2) = 2 * ( √2)² - 4 = 0

f ( 2 )= 2 * 2² - 4 = 4

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