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Vintz63
@Vintz63
May 2019
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On considère l'expression A =1-4x²-(2x+1)²
1/Développe puis réduis l'expression A.
2/Factorise 1-4x²
3/En déduire la factorisation de l'expression A.
4/Calcule A pour x = -7
bonjsoir, avez vous une réponse svp ?
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Christine17
Verified answer
A =1-4x²-(2x+1)²
A=1-4x²-(4x²+1+4x)
A=
1-4x²-4x²-1-4x
A=-8x²-4x
A=-4x(2x+1)
2)
1-4x²=(1-2x)(1+2x)
3)
A =1-4x²-(2x+1)²
A=
(1-2x)(1+2x)-(2x+1)²
A=(2x+1)(-2x+1)-(2x+1)
A=
(2x+1)(-2x+1-2x-1)
A=
(2x+1)(-4x)
A=-4x(2x+1)
4)x=-7
A=28(-13)
A=-364
1 votes
Thanks 2
nini999
Bonjour :
1)
A = 1 - 4x² - (2x + 1)²
(2x + 1)² il prend la forme de (a+b)² = a²+2ab+b²
Alors :
A = 1 - 4x² - (4x² + 4x + 1)
A = 1 - 4x² - 4x² - 4x - 1
A = 1 - 1 - 4x² - 4x² - 4x
A = 0 - 8x² - 4x
A = -8x² - 4x
2)
1 - 4x²
1² - (2x)²
1² - (2x)² il prend la forme de a²-b² = (a-b)(a+b)
Alors :
(1 - 2x)(1 + 2x)
3)
A = 1 - 4x² - (2x + 1)²
A = (1 - 2x)(1 + 2x) - (2x + 1)²
A = (1 - 2x)(2x + 1) - (2x + 1)²
____ ______
Alors :
A = (2x + 1)[(1 - 2x) - (2x + 1)]
A = (2x + 1)(1 - 2x - 2x - 1)
A = (2x + 1)(1 - 1 - 2x - 2x)
A = (2x + 1)(0 - 4x)
A = -4x(2x + 1)
4)
C'est ton tour
J’espère t'avoir t'aider
1 votes
Thanks 1
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Verified answer
A =1-4x²-(2x+1)²A=1-4x²-(4x²+1+4x)
A=1-4x²-4x²-1-4x
A=-8x²-4x
A=-4x(2x+1)
2)
1-4x²=(1-2x)(1+2x)
3)
A =1-4x²-(2x+1)²
A=(1-2x)(1+2x)-(2x+1)²
A=(2x+1)(-2x+1)-(2x+1)
A=(2x+1)(-2x+1-2x-1)
A=(2x+1)(-4x)
A=-4x(2x+1)
4)x=-7
A=28(-13)
A=-364
1)
A = 1 - 4x² - (2x + 1)²
(2x + 1)² il prend la forme de (a+b)² = a²+2ab+b²
Alors :
A = 1 - 4x² - (4x² + 4x + 1)
A = 1 - 4x² - 4x² - 4x - 1
A = 1 - 1 - 4x² - 4x² - 4x
A = 0 - 8x² - 4x
A = -8x² - 4x
2)
1 - 4x²
1² - (2x)²
1² - (2x)² il prend la forme de a²-b² = (a-b)(a+b)
Alors :
(1 - 2x)(1 + 2x)
3)
A = 1 - 4x² - (2x + 1)²
A = (1 - 2x)(1 + 2x) - (2x + 1)²
A = (1 - 2x)(2x + 1) - (2x + 1)²
____ ______
Alors :
A = (2x + 1)[(1 - 2x) - (2x + 1)]
A = (2x + 1)(1 - 2x - 2x - 1)
A = (2x + 1)(1 - 1 - 2x - 2x)
A = (2x + 1)(0 - 4x)
A = -4x(2x + 1)
4)
C'est ton tour
J’espère t'avoir t'aider