bonjour
f (x) = 3 x² - 3 x - 1
f ( 8/7 ) = 3 (8/7 )² - 3 *8/7 - 1
f ( 8/7 ) = 3 * 64/49 - 24/7 - 1
f ( 8/7 ) = 192/49 - 168/49 - 49/49
= 25/49
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bonjour
f (x) = 3 x² - 3 x - 1
f ( 8/7 ) = 3 (8/7 )² - 3 *8/7 - 1
f ( 8/7 ) = 3 * 64/49 - 24/7 - 1
f ( 8/7 ) = 192/49 - 168/49 - 49/49
= 25/49