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
Mathématiques
wassimnemry
Question
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
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
1 Réponse
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1. Réponse maudmarine
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.