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Rifino34
@Rifino34
May 2019
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URGENT DM !!!
a.Factoriser l'expression :
E=(c+5)²-9
b.Résoudre l'équation :
(x+8)(x+2)=0
a.Factoriser l'expression :
F=16-(2x-1)²
b.Résoudre l'équation : (3+2x)(5-2x)=0
a.Factoriser l'expression :
G='4x-3)²-x²
b.Résoudre l'équation : (5x-3)(3x-3)=0
Svpp je ne comprend pas !! Aidez-moi !!
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fransey
E = (c + 5)² - 9
E = (c+5)² - 3² tu as a² - b² = (a-b)(a+b)
E= (c+5-3)(c+5+3)
E=(c+2)(c+8)
(x +8)(x+2)=0
donc x+8 = 0 ou x+2=0
x=-8 x=-2
F=16-(2x-1)²
F=4² - (2x-1)²
F=(4-2x+1)(4+2x-1)
F=(-2x +5)(2x+3)
(3+2x)(5-2x)=0
3+2x=0 ou 5-2x=0
2x=-3 -2x=-5
x=-3/2 x= 5/2
G= (4x-3)² - x²
G= (4x-3-x)(4x-3+x)
G=(3x-3)(5x-3)
(5x-3)(3x-3)=0
5x-3=0 ou 3x-3=0
5x=3 3x=3
x=3/5 x=1
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E = (c+5)² - 3² tu as a² - b² = (a-b)(a+b)
E= (c+5-3)(c+5+3)
E=(c+2)(c+8)
(x +8)(x+2)=0
donc x+8 = 0 ou x+2=0
x=-8 x=-2
F=16-(2x-1)²
F=4² - (2x-1)²
F=(4-2x+1)(4+2x-1)
F=(-2x +5)(2x+3)
(3+2x)(5-2x)=0
3+2x=0 ou 5-2x=0
2x=-3 -2x=-5
x=-3/2 x= 5/2
G= (4x-3)² - x²
G= (4x-3-x)(4x-3+x)
G=(3x-3)(5x-3)
(5x-3)(3x-3)=0
5x-3=0 ou 3x-3=0
5x=3 3x=3
x=3/5 x=1