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Cacadechameau
@Cacadechameau
April 2019
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Factoriser le menbre de gauche puis résoudre l'équation
a.x²+5x B.4x²-7x=0
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Bonsoir
Cacadechameau
a) x² + 5x = x * x + 5 * x
= (x + 5) * x
=
x(x + 5)
x² + 5x = 0
x(x + 5) = 0
x = 0 ou x + 5 = 0
x = 0 ou x = -5
L'ensemble des solutions est S = {0 ; 5}
b) 4x² - 7x = 4x * x - 7 * x
= (4x - 7) * x
=
x(4x - 7)
4x² - 7x = 0
x(4x - 7) = 0
x = 0 ou 4x - 7 = 0
x = 0 ou 4x = 7
x = 0 ou x = 7/4
L'ensemble des solutions est S = {0 ; 7/4}
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Verified answer
Bonsoir Cacadechameaua) x² + 5x = x * x + 5 * x
= (x + 5) * x
= x(x + 5)
x² + 5x = 0
x(x + 5) = 0
x = 0 ou x + 5 = 0
x = 0 ou x = -5
L'ensemble des solutions est S = {0 ; 5}
b) 4x² - 7x = 4x * x - 7 * x
= (4x - 7) * x
= x(4x - 7)
4x² - 7x = 0
x(4x - 7) = 0
x = 0 ou 4x - 7 = 0
x = 0 ou 4x = 7
x = 0 ou x = 7/4
L'ensemble des solutions est S = {0 ; 7/4}