Bonjour quelqu’un peut me faire ces exercices svp?!

Explications étape par étape:

lorsque x = - 1

7 X 1 - (2 - ( - 1 )) (5 + 3 ( - 1 )

7 - ( 2 - ( - 1 )) ( 5 + 3 ( - 1 ))

7 - ( 2 + 1 ) ( 5 + 3 ( - 1 ))

7 - 3 ( 5 + 3 ( - 1 ))

7 - 3 ( 5 - 3 )

7 - 3 X 2

7 - 6

1

exo 2

x^2 + 3 - 2 + x - ( 5 + 3x^2 )

x^2 + 3 - 2 + x - ( 5 - 3x^2 )

x^2 + 1 + x - ( 5 + 3x^2 )

x^2 + 1 + x - 5 - 3x^2

x^2 - 4 + x - 3x^2

- 2x^2 + x - 4

2 ( - 2 ) x^2-1 + x^1-1

- 4x^2-1 + x^1-1

- 4x^1 + x ^0

-4x + 1

exo 3

2x + 7x^2 - 3 X 2x + 5x ( - x ) - 9 - 2x^2 X 4 + 3x + 2

2x + 7x^2 - 6x + 5x ( - x ) - 9 - 2x^2 X 4 + 3x + 2

-4x + 7x^2 + 5x ( - x ) - 9 - 8x^2 + 3x + 2

- 4x - x^2 + 5x ( - x ) - 9 + 3x + 2

- x - x^2 + 5x ( - x ) - 9 + 2

- x - x^2 + 5x ( - x ) - 7

- x - x^2 + 5x^2 ( - 1 ) - 7

- x - x ^2 - 5x^2 - 7

- 6x^2 - x - 7

exo 4

6 - 15 + 1 - ( 1 - 3 ( - 3 )) = - 12 - ( - 3 )^2 + 3

- 8 - ( 1 - 3 ( - 3 )) = - 12 - ( - 3 )^2 + 3

- 8 - ( 1 - ( - 9 )) = - 12 - ( - 3 )^2 + 3

- 8 - ( 1 + 9 ) = - 12 - ( - 3 )^2 + 3

- 8 - 10 = - 12 + ( - 3 )^2 + 3

- 18 = - 12 - 9 + 3

- 18 = - 21 + 3

- 18 = - 18

VRAI

exo 5

A = 8x^2 - 14x + 3

B = - 14x^2 + 31x + 10

C = 16x^2 - 24x + 9