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Sagot :

Salut !

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

  = 4x + 5 - (x²+5x+2x+10)

  = 4x + 5 - x² - 5x - 2x - 10

  = -x² - 3x - 5

B = 3(7x-2) - (2x-5)(4x-8)

   = 21x - 6 - (8x²-16x-20x+40)

   = 21x - 6 - 8x² + 16x + 20x - 40

   = -8x² + 57x - 46

INEQUATION

Bonjour,

Développer:

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

A= 4x+5- (x²+2x+5x+10)

A= 4x+5-(x²+7x+10)

A= 4x+5-x²-7x-10

A= -x²-3x-5

B= 3(7x-2)-(2x-5)(4x-8)

B= 21x-6- (8x²-20x-16x+40)

B= 21x-6- 8x²+36x-40

B= -8x²+57x-46

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