bonjour
A = 7 x - ( 28 x² - 12 x + 21 x - 9 )
= 7 x - 28 x² + 12 x - 21 x + 9
= - 28 x² - 2 x + 9
B = - 14 + 21 x + 12 x - 18 x² - 8 x² - 4 x
= - 26 x² + 29 x - 14
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bonjour
A = 7 x - ( 28 x² - 12 x + 21 x - 9 )
= 7 x - 28 x² + 12 x - 21 x + 9
= - 28 x² - 2 x + 9
B = - 14 + 21 x + 12 x - 18 x² - 8 x² - 4 x
= - 26 x² + 29 x - 14