Calcul De Maths

[roby67]

bonjour j'ai un petit calcul de maths

merci pour votre aide

 

 

Factoriser

N= (4x-5)(x-3)-(3x+1)(4x-5)

1 factoriser l’expression de N

Calculer l’expression, pour x = -1

F = 25 – 9 x² + (5-3x)²

1 Factoriser l’expression de F

Calculer l’expression de F pour x = -1

[hardcore6]

N = ( 4x-5 ) ( x-3 ) - ( 3x +1 ) ( 4x-5 )

N = (4x-5) [(x-3)-(3x+1)]

N = (4x-5) [x-3-3x+1]

N = (4x-5) (-2x - 2 )

 

x = -1

 

N = ( 4*-1 -5 ) ( -1*-3 ) - ( 3*-1 +1 ) ( 4*-1-5 )

N = -4 [ (-1* (-3) ) - ( 3* (-1) +1 )

N = -4 [ -1* (-3) - 3*(-1) +1 ]

N = -4 ( 3-3+1 )

N = -4 

 

 

 

[eli2b]

N = ( 4x-5 ) ( x-3 ) - ( 3x +1 ) ( 4x-5 )

N = (4x-5) [(x-3)-(3x+1)]

N = (4x-5) [x-3-3x+1]

N = (4x-5) (-2x - 2 )

x = -1

N = ( 4*-1 -5 ) ( -1*-3 ) - ( 3*-1 +1 ) ( 4*-1-5 )

N = -4 [ (-1* (-3) ) - ( 3* (-1) +1 )

N = -4 [ -1* (-3) - 3*(-1) +1 ]

N = -4 ( 3-3+1 )

N = -4

[Barbidoux]

Factoriser

N= (4x-5)(x-3)-(3x+1)(4x-5)=(4*x-5)*(x-3-3*x-1)=-(4*x-5)*(2*x+4)

1 factoriser l’expression de N

Calculer l’expression, pour x = -1

F = 25 – 9 x² + (5-3x)²=(5-3*x)*(5+3*x)+(5-3*x)^3=(5-3*x)*(5+3*x+5-3*x)=10*(5-3*x)

1 Factoriser l’expression de F

Calculer l’expression de F pour x = -1

F(-1)=10*(5+3)=80

[roby67]

N= (4x-5)(x-3)-(3x+1)(4x-5)=(4*x-5)*(x-3-3*x-1)=-(4*x-5)*(2*x+4)

 

c'est pas plutôt (4x  - 5) (2x-4)

[Barbidoux]

N= (4x-5)(x-3)-(3x+1)(4x-5)=(4*x-5)*(x-3-3*x-1)=-(4*x-5)*(2*x+4)

 

c'est pas plutôt (4x  - 5) (2x-4)