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Sagot :

Bonjour

1)

A = (x - 9)²

A = x² - 18x + 81

B = (5x + 2) (5x - 2)

B = 25x² - 4

C = (10 - 2x)²

C = 100 - 40x + 4x²

C = 4x² - 40x + 100

2)

D = 10x² - (x² - 2x + 1) + (3x² + x - 5) + 7

D = 10x² - x² + 2x - 1 + 3x² + x - 5 + 7

D = 10x² + 3x² - x² + 2x + x - 1 - 5 + 7

D = 12x² + 3x + 1.

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