Développer et réduire (x – 5)(x + 1) = (3 + x) x =

Présentation au sujet: "Développer et réduire (x – 5)(x + 1) = (3 + x) x ="— Transcription de la présentation:

1 Développer et réduire (x – 5)(x + 1) = (3 + x) x =

2 Calcul 1 (3x – 1) x =

3 Calcul 2 (x – 1)(x + 5) =

4 Calcul 3 (-x – 7) x =

5 Calcul 4 (x – 3)(x – 5) =

6 Calcul 5 (x – 5)(x + 5) =

7 Prêt pour la correction…

8 Calcul 1 (3x – 1) x

9 Calcul 1 (3x – 1) x = 3x x x – 1 x x

10 Calcul 1 (3x – 1) x = 3x x x – 1 x x = 3x² – x

11 Calcul 2 (x – 1)(x + 5)

12 Calcul 2 (x – 1)(x + 5) = x x x + x x 5 – 1 x x – 1 x 5

13 (x – 1)(x + 5) = x x x + x x 5 – 1 x x – 1 x 5 = x² + 5x – x – 5
Calcul 2 (x – 1)(x + 5) = x x x + x x 5 – 1 x x – 1 x 5 = x² + 5x – x – 5

14 (x – 1)(x + 5) = x x x + x x 5 – 1 x x – 1 x 5 = x² + 5x – x – 5
Calcul 2 (x – 1)(x + 5) = x x x + x x 5 – 1 x x – 1 x 5 = x² + 5x – x – 5 = x² + 4x – 5

15 Calcul 3 (-x – 7) x

16 Calcul 3 (-x – 7) x = -x x x – 7 x x

17 Calcul 3 (-x – 7) x = -x x x – 7 x x = -x² – 7x

18 Calcul 4 (x – 3)(x - 5)

19 Calcul 4 (x – 3)(x - 5) = x x x – x x 5 – 3 x x + 3 x 5

20 (x – 3)(x - 5) = x x x – x x 5 – 3 x x + 3 x 5 = x² – 5x – 3x + 15
Calcul 4 (x – 3)(x - 5) = x x x – x x 5 – 3 x x + 3 x 5 = x² – 5x – 3x + 15

21 (x – 3)(x - 5) = x x x – x x 5 – 3 x x + 3 x 5 = x² – 5x – 3x + 15
Calcul 4 (x – 3)(x - 5) = x x x – x x 5 – 3 x x + 3 x 5 = x² – 5x – 3x + 15 = x² – 8x + 15

22 Calcul 5 (x – 5)(x + 5)

23 Calcul 5 (x – 5)(x + 5) = x x x + x x 5 – 5 x x – 5 x 5

24 (x – 5)(x + 5) = x x x + x x 5 – 5 x x – 5 x 5 = x² + 5x – 5x – 25
Calcul 5 (x – 5)(x + 5) = x x x + x x 5 – 5 x x – 5 x 5 = x² + 5x – 5x – 25

25 (x – 5)(x + 5) = x x x + x x 5 – 5 x x – 5 x 5 = x² + 5x – 5x – 25
Calcul 5 (x – 5)(x + 5) = x x x + x x 5 – 5 x x – 5 x 5 = x² + 5x – 5x – 25 = x² – 25

26 1. 3x² – x 2. x² + 4x – 5 3. -x² – 7x 4. x² – 8x + 15 5. x² – 25