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bonjour

A =  21 x² - 3 x + 7 x - 1  + 29 x² + x + 21 x - 12 +  1  - x

  =  50 x² + 25 x - 12

B  =  25 x² + 20 x + 20 x + 16 + 25 x² - 35 x + 20 x - 28

   =  50 x² + 25 x  - 12

maudmarine

Bonjour

A = (3x + 1) (7x - 1) + x (29x + 1) + 3 (7x - 4) + 1 - x

A = 21x² - 3x + 7x - 1 + 29x² + x + 21x - 12 + 1 - x

A = 21x² + 29x² - 3x - x + 7x + 21x + x - 1 + 1 - 12

A  = 50x² + 25x - 12

B = (5x + 4) (5x + 4) + (5x + 4) (5x - 7)

B = 25x² + 20x + 20x + 16 + 25x² - 35x + 20x - 28

B = 25x² + 25x² + 20x + 20x + 20x - 35x + 16 - 28

B = 50x²  + 25x - 12.

A = B.