Réponse :
Explications étape par étape :
x² = 3x + 8 → x² - 3x - 8 = 0
Δ = (-3)² - 4*1*(-8) = 9 + 32 = 41
2 solutions :
x = (3 - √41)/2 et x = (3 + √41)/2 : S = {(3 - √41)/2 ; (3 + √41)/2 }
x² = 7x + 4 → x² - 7x - 4 = 0
Δ = (-7)² - 4*1*(-4) = 49 + 16 = 65
x = (7 - √65)/2 et x = (7 + √65)/2 : S = { (7 - √65)/2 ; (7 + √65)/2 }
x² = 5x + 3 → x² - 5x - 3 = 0
Δ = (-5)² - 4*1*(-3) = 25 +12 = 37
x = (5 - √37)/2 et x = (5 + √37)/2 : S = { (5 - √37)/2 ; (5 + √37)/2 }
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Réponse :
Explications étape par étape :
x² = 3x + 8 → x² - 3x - 8 = 0
Δ = (-3)² - 4*1*(-8) = 9 + 32 = 41
2 solutions :
x = (3 - √41)/2 et x = (3 + √41)/2 : S = {(3 - √41)/2 ; (3 + √41)/2 }
x² = 7x + 4 → x² - 7x - 4 = 0
Δ = (-7)² - 4*1*(-4) = 49 + 16 = 65
2 solutions :
x = (7 - √65)/2 et x = (7 + √65)/2 : S = { (7 - √65)/2 ; (7 + √65)/2 }
x² = 5x + 3 → x² - 5x - 3 = 0
Δ = (-5)² - 4*1*(-3) = 25 +12 = 37
x = (5 - √37)/2 et x = (5 + √37)/2 : S = { (5 - √37)/2 ; (5 + √37)/2 }