Exercices Développer et réduire chaque expression : A = (3x + 4)(x + 2) + (5x +1 ) (x - 2) B = (2x + 5) (-x + 2) - (x-3)(-3x +4) C = (x-8) 1. Cald E = 4 (x-2) +

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Développer et réduire chaque expression :

A = (3x + 4)(x + 2) + (5x +1 ) (x - 2)

A = 3x² + 6x + 4x + 8 + 5x²- 10x + x - 2

A = 3x² + 5x² + 6x + 4x + x - 10x + 8 - 2

A = 8x² + x + 6

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

B = - 2x + 4x - 5x + 10 - (- 3x² + 4x + 9x - 12)

B = - 2x + 4x - 5x + 10 + 3x² - 4x - 9x + 12

B = 3x² - 2x - 5x - 4x - 9x + 4x + 10 + 12

B = 3x² - 18x + 22

C = (x-8) ²

C = x² - 16x + 64

E = 4 (x-2) + 6( 3x + 4)

E = 4x - 8 + 18x + 24

E = 4x + 18x - 8 + 24

E = 22x + 16.