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Sagot :

Bonjour

Développer puis réduire chaque expression :

A = (4x + 3)²

A = 16x² + 24x + 9

B = 6 + (5x - 2) (3 - 4x)

B = 6 + 15x - 20x² - 6 + 8x

B = - 20x² + 15x + 8x + 6 - 6

B = - 20x² + 23x

C = 5x - (4x + 3) (- 2x - 5)

C = 5x - (- 8x² - 20x - 6x - 15)

C = 5x + 8x² + 20x + 6x + 15

C = 8x² + 5x + 20x + 6x + 15

C = 8x² + 31x + 15

D = 6 (2x - 1) (3 - x)

D = 6 (6x - 2x² - 3 + x)

D = 36x - 12x² - 18 + 6x

D = - 12x² + 36x + 6x - 18

D = - 12x² + 42x - 18.

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