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Romain123
@Romain123
April 2019
2
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DM : Equations et Factorisation ( Urgent)
il me faut tous les détails de calculs SVP
a) Factoriser : 25x²-4 puis factoriser : A= 25x²-4+(2x+3)(5x+2)
b) Factoriser : x²-14x+49 puis factoriser : B= (3x-4)(x-7)+(x²-14x+49)
c) Résoudre les équations : A=0 et B=0.
Pouvez vous m'aider SVP !
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jennyf
25x²-4=(5x)²-2²=(5x-2)(5x+2)
A=
25x²-4+(2x+3)(5x+2)
A=(5x-2)(5x+2)+(2x+3)(5x+2)
A=(5x+2)(5x-2+2x+3)
A=(5x+2)(7x+1)
b)
x²-14x+49=(x-7)²
B=
(3x-4)(x-7)+(x²-14x+49)
B=(3x-4)(x-7)+(x-7)²
B=(x-7)(3x-4+x-7)
B=(x-7)(4x-11)
c)
A=0
(5x+2)(7x+1)=0
5x+2=0
5x=-2
x=-2/5
7x+1=0
x=-1/7
B=0
(x-7)(4x-11)=0
x-7=0
x=7
4x-11=0
4x=11
x=11/4
2 votes
Thanks 2
telephone16
A) Factorisation 25x² +4+(2x+3)(5x+2)
(5x-2)(
5x+2)
+ (2x+3)(
5x +2)
(5x+2) (5x-2 +2x+3)
(5x+2)(7x +1)
x² -14x +49 = (x-7)(x-7)
B = (3x-4)(x-7)+(x² -14x+49)
(3x-4)(
x-7)
+(x-7)
(x-7)
(x-7)(3x-4 +x-7)
(x-7) (4x -11)
Equations
25x²-4+(2x+3)(5x+2) = 0
(5x-2)(5x+2) + (2x+3)(5x+2)=0
Si A = 0 cette équation n'a pas de solution.
2 votes
Thanks 2
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A=25x²-4+(2x+3)(5x+2)
A=(5x-2)(5x+2)+(2x+3)(5x+2)
A=(5x+2)(5x-2+2x+3)
A=(5x+2)(7x+1)
b)
x²-14x+49=(x-7)²
B= (3x-4)(x-7)+(x²-14x+49)
B=(3x-4)(x-7)+(x-7)²
B=(x-7)(3x-4+x-7)
B=(x-7)(4x-11)
c)
A=0
(5x+2)(7x+1)=0
5x+2=0
5x=-2
x=-2/5
7x+1=0
x=-1/7
B=0
(x-7)(4x-11)=0
x-7=0
x=7
4x-11=0
4x=11
x=11/4
(5x-2)(5x+2) + (2x+3)(5x +2)
(5x+2) (5x-2 +2x+3)
(5x+2)(7x +1)
x² -14x +49 = (x-7)(x-7)
B = (3x-4)(x-7)+(x² -14x+49)
(3x-4)(x-7)+(x-7)(x-7)
(x-7)(3x-4 +x-7)
(x-7) (4x -11)
Equations
25x²-4+(2x+3)(5x+2) = 0
(5x-2)(5x+2) + (2x+3)(5x+2)=0
Si A = 0 cette équation n'a pas de solution.