bonjour
f 1 = 2 ( - 5 + 2 x² ) = - 10 + 4 x² = d
f 2 = ( 2 x + 3) ( 2 x + 9 ) = 4 x² + 18 x + 6 x + 27 = 4 x² + 24 x + 27
c = 4 ( x - 3 )² - 10 = 4 ( x² - 6 x + 9 ) - 10 = 4 x² - 24 x + 36 - 10
= 4 x² - 24 x + 26 = f 3
f (4) = ( 2 x - 6 )² + 10 = 4 x² - 24 x +36 + 10 = 4 x² - 24 x + 46 = b
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bonjour
f 1 = 2 ( - 5 + 2 x² ) = - 10 + 4 x² = d
f 2 = ( 2 x + 3) ( 2 x + 9 ) = 4 x² + 18 x + 6 x + 27 = 4 x² + 24 x + 27
c = 4 ( x - 3 )² - 10 = 4 ( x² - 6 x + 9 ) - 10 = 4 x² - 24 x + 36 - 10
= 4 x² - 24 x + 26 = f 3
f (4) = ( 2 x - 6 )² + 10 = 4 x² - 24 x +36 + 10 = 4 x² - 24 x + 46 = b