bonjour
A = - 2 x² - 6 x + x + 3 - 2 x + 10 = - 2 x² - 7 x + 13
B = ( 12 x + 9) ( x + 1) + x² + 2 x + 1
= 12 x² + 12 x + 9 x + 9 + x² + 2 x + 1
= 13 x² + 23 x + 10
C = 6 x² + 15 x - 2 x - 5 - ( 3 x + 3) ( x - 2)
= 6 x² + 13 x - 5 - ( 3 x² - 6 x + 3 x - 6)
= 6 x² + 13 x - 5 - 3 x² + 6 x - 3 x + 6
= 3 x² + 16 x + 1
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bonjour
A = - 2 x² - 6 x + x + 3 - 2 x + 10 = - 2 x² - 7 x + 13
B = ( 12 x + 9) ( x + 1) + x² + 2 x + 1
= 12 x² + 12 x + 9 x + 9 + x² + 2 x + 1
= 13 x² + 23 x + 10
C = 6 x² + 15 x - 2 x - 5 - ( 3 x + 3) ( x - 2)
= 6 x² + 13 x - 5 - ( 3 x² - 6 x + 3 x - 6)
= 6 x² + 13 x - 5 - 3 x² + 6 x - 3 x + 6
= 3 x² + 16 x + 1