bonsoir
A = 9 x² + 30 x + 25 - ( 25 x² - 40 x + 1 6)
= 9 x² + 30 x + 25 - 25 x² + 40 x - 16
= - 14 x² + 70 x + 9
B = 4 x² - 28 x + 49 - ( 6 x² + 10 x - 21 x - 35 )
= 4 x² - 28 x + 49 - 6 x² - 10 x + 21 x + 35
= - 2 x² - 17 x + 84
C = incomplète
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bonsoir
A = 9 x² + 30 x + 25 - ( 25 x² - 40 x + 1 6)
= 9 x² + 30 x + 25 - 25 x² + 40 x - 16
= - 14 x² + 70 x + 9
B = 4 x² - 28 x + 49 - ( 6 x² + 10 x - 21 x - 35 )
= 4 x² - 28 x + 49 - 6 x² - 10 x + 21 x + 35
= - 2 x² - 17 x + 84
C = incomplète