Répondre :
bonsoir
f (x) = ( x + 6 )² - ( x - 6 )²
f (x) = x² + 12 x + 36 - ( x² - 12 x + 36 )
f (x) = x² + 12 x + 36 - x² + 12 x - 36
f (x) = 24 x
bonsoir
f (x) = ( x + 6 )² - ( x - 6 )²
f (x) = x² + 12 x + 36 - ( x² - 12 x + 36 )
f (x) = x² + 12 x + 36 - x² + 12 x - 36
f (x) = 24 x