Bonjour
On donne :
A = (6x + 4)( x + 7);
B = (3x + 8)²;
C = 8x - (2x + 7) et
D = 3x² + 2x +9.
1) Développer A et B
A = (6x + 4)( x + 7)
A = 6x^2 + 42x + 4x + 28
A = 6x^2 + 46x + 28
B = (3x + 8)²
B = (3x)^2 + 2 * 3x * 8 + 8^2
B = 9x^2 + 48x + 64
2) Réduire C
C = 8x - (2x + 7)
C = 8x - 2x - 7
C = 6x - 7
3) Calculer D pour x = -1
D = 3x² + 2x +9
D = 3 * (-1)^2 + 2 * (-1) + 9
D = 3 - 2 + 9
D = 1 + 9
D = 10
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Bonjour
On donne :
A = (6x + 4)( x + 7);
B = (3x + 8)²;
C = 8x - (2x + 7) et
D = 3x² + 2x +9.
1) Développer A et B
A = (6x + 4)( x + 7)
A = 6x^2 + 42x + 4x + 28
A = 6x^2 + 46x + 28
B = (3x + 8)²
B = (3x)^2 + 2 * 3x * 8 + 8^2
B = 9x^2 + 48x + 64
2) Réduire C
C = 8x - (2x + 7)
C = 8x - 2x - 7
C = 6x - 7
3) Calculer D pour x = -1
D = 3x² + 2x +9
D = 3 * (-1)^2 + 2 * (-1) + 9
D = 3 - 2 + 9
D = 1 + 9
D = 10