Bonjour,
1) Développer et réduire :
I = (2x + 7)(2x - 7)
I = (2x)² - 7² = 4x² - 49
T = x(7x + 5)
T = x * 7x + 5x
T = 7x² + 5x
B = (8x - 11)(4x - 5)
B = 8x * 4x - 8x * 5 - 11 * 4x + 11 * 5
B = 32x² - 40x - 44x + 55
B = 32x² - 84x + 55
J = (3 - 2x)²
J = 3² - 2 × 3 × 2x + (2x)²
J = 4x² - 12x + 9
O = (5x - 8)(5x - 7)
O = 5x * 5x - 5x * 7 - 8 * 5x + 8 * 7
O = 25x² - 35x - 40x + 56
O = 25x² - 75x + 56
A = (5x + 1)²
A = 5x² + 2 × 5x × 1 + 1²
A = 25x² + 10x + 1
Bonne journée.
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Bonjour,
1) Développer et réduire :
I = (2x + 7)(2x - 7)
I = (2x)² - 7² = 4x² - 49
T = x(7x + 5)
T = x * 7x + 5x
T = 7x² + 5x
B = (8x - 11)(4x - 5)
B = 8x * 4x - 8x * 5 - 11 * 4x + 11 * 5
B = 32x² - 40x - 44x + 55
B = 32x² - 84x + 55
J = (3 - 2x)²
J = 3² - 2 × 3 × 2x + (2x)²
J = 4x² - 12x + 9
O = (5x - 8)(5x - 7)
O = 5x * 5x - 5x * 7 - 8 * 5x + 8 * 7
O = 25x² - 35x - 40x + 56
O = 25x² - 75x + 56
A = (5x + 1)²
A = 5x² + 2 × 5x × 1 + 1²
A = 25x² + 10x + 1
Bonne journée.