bonjour. vous pouvez m'aider SVP​

Exercice 1 :

(9 - 2x)(x+6) + 7(2x - 5)

= 9x + 54 - 2x² -12x + 14x - 35

= 2x² + 11x + 19

(2x + 5)²

=(2x + 5)(2x + 5)

=4x² + 10x + 10x + 25

= 4x² + 20x + 25

Exercice 2 :

Question 1 -

on choisit 3  

3 - 1 = 2

2² = 4

4 + 6 = 10

Oui on obtient bien 10.

Question 2

on choisit 3

3² = 9

on ajoute 1 = 10

Question 3

on choisit -2

- 2 - 1 = -3

(-3)² = 9

9 - (-4) = 9 + 4 = 13

Question 4

x² + 1 = 5

x² = 4

x = 2

Question 5

Programme A = (x - 1)² + 2x

= (x-1)(x-1) + 2x

= x² -x -x + 1 + 2x

= x² + 1

Programme B = x² + 1

Oui les deux programmes sont identiques.