Factoriser 3x + 15 = ? 3x(x + 1) + 5(x + 1) = ?
Calcul 1 3(3x + 8) + 8x(3x + 8)
Calcul 2 10 – 5x
Calcul 3 9 – 18x
Calcul 4 x² + x
Calcul 5 8x² – 3x
Prêt pour la correction…
Calcul 1 3(3x + 8) + 8x(3x + 8)
Calcul 1 3(3x + 8) + 8x(3x + 8) a x k + b x k
Calcul 1 3(3x + 8) + 8x(3x + 8) = (3x + 8)(3 + 8x)
Calcul 2 10 – 5x
Calcul 2 10 – 5x = 5 x 2 – 5 x x
Calcul 2 10 – 5x = 5 x 2 – 5 x x
Calcul 2 10 – 5x = 5 x 2 – 5 x x = 5 (2 – x)
Calcul 3 9 – 18x
Calcul 3 9 – 18x = 9 x 1 – 9 x 2x
Calcul 3 9 – 18x = 9 x 1 – 9 x 2x
Calcul 3 9 – 18x = 9 x 1 – 9 x 2x = 9(1 – 2x)
Calcul 4 x² + x
Calcul 4 x² + x = x x x + x x 1
Calcul 4 x² + x = x x x + x x 1
Calcul 4 x² + x = x x x + x x 1 = x (x + 1)
Calcul 5 8x² – 3x
Calcul 5 8x² – 3x = x x 8 x – x x 3
Calcul 5 8x² – 3x = x x 8 x – x x 3
Calcul 5 8x² – 3x = x x 8 x – x x 3 = x(8x – 3)
1. (3x + 8)(3 + 8x) 2. 5 (2 – x) 3. 9(1 – 2x) 4. x (x + 1) 5. x(8x – 3)