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Niveau 3 (8 points)
A. x(2x - 1) - (3x + 1)
| B. (2x + 1)2 + 3(x – 5)
C.(2x - 1)(2x + 1) - 4x(x - 1)
D.-2(5 + 2x)2 – (3x + 4)(x - 2
Svp aider moi


Répondre :

Bonjour,

A. x(2x - 1) - (3x + 1)

= 2x² - 1 - 3x - 1

= 2x² - 3x - 2

| B. (2x + 1)² + 3(x – 5)

= 4x² + 4x + 1 + 3x - 15

= 4x² + 7x - 14

C.(2x - 1)(2x + 1) - 4x(x - 1)

= 4x² - 1 - 4x² + 4x

= 4x - 1

D.-2(5 + 2x)²– (3x + 4)(x - 2)

= 2 (25 + 20x + 4x²) - (3x² - 6x + 4x - 8)

= 50 + 40x + 8x² - 3x² + 6x - 4x + 8

= 5x² + 42x + 58.