bonjour
A = 6 x² + 24 x - 4 x - 16 - ( - 6 x + 24 + 10 x² - 40 x )
= 6 x² + 20 x - 16 + 6 x - 24 - 10 x² + 40 x
= - 4 x² + 66 x - 40
B = x² + 2 x + x + - 5 x - 10
= x² - 2 x - 10
C = (4 x² - 1 ) ( 2 x² + 6 x - 4 x - 12 )
= 8 x ⁴ + 24 x³ - 16 x ³ - 48 x² - 2 x² - 6 x + 4 x + 12
= 8 x ⁴ + 8 x ³ - 50 x² - 2 x + 12
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bonjour
A = 6 x² + 24 x - 4 x - 16 - ( - 6 x + 24 + 10 x² - 40 x )
= 6 x² + 20 x - 16 + 6 x - 24 - 10 x² + 40 x
= - 4 x² + 66 x - 40
B = x² + 2 x + x + - 5 x - 10
= x² - 2 x - 10
C = (4 x² - 1 ) ( 2 x² + 6 x - 4 x - 12 )
= 8 x ⁴ + 24 x³ - 16 x ³ - 48 x² - 2 x² - 6 x + 4 x + 12
= 8 x ⁴ + 8 x ³ - 50 x² - 2 x + 12