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
