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Jbzz
@Jbzz
June 2019
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Bonsoir pouvez-vous m'aider : résoudre ces équations :
9x² -49 = 0
4x² -5 = 0
Merci d'avance !
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Skabetix
Verified answer
Bonjour,
9x^2 -49 = 0
a^2 - b^2
(3x) ^2 - 7^2 = 0
(3x - 7)(3x +7)= 0
3x + 7 = 0
3x = -7
x = -7/3.
3x -7 = 0
3x = 7
x = 7/3
b)
4x^2- 5 = 0
(4x + ✓5) (4x - ✓5)= 0
4x -✓5 = 0
4x = ✓5
x = ✓5/4
4x + ✓5 = 0
4x = -✓5
x = -✓5/4
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Verified answer
Bonjour,9x^2 -49 = 0
a^2 - b^2
(3x) ^2 - 7^2 = 0
(3x - 7)(3x +7)= 0
3x + 7 = 0
3x = -7
x = -7/3.
3x -7 = 0
3x = 7
x = 7/3
b)
4x^2- 5 = 0
(4x + ✓5) (4x - ✓5)= 0
4x -✓5 = 0
4x = ✓5
x = ✓5/4
4x + ✓5 = 0
4x = -✓5
x = -✓5/4