bonjour
x² + 10x = 39 <=> x² + 10x - 39 = 0
on calcule le discriminant
Δ = b² − 4ac = (-10) ² - 4*1*(-39)
= 100 + 156 = 256 = 16²
x1 = (-10 - 16)/2 = -26/2 = -13 (on utilise les formules du cours)
x2 = (-10 + 16)/2 = 6/2 = 3
S = {-13 ; 3}
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bonjour
x² + 10x = 39 <=> x² + 10x - 39 = 0
on calcule le discriminant
Δ = b² − 4ac = (-10) ² - 4*1*(-39)
= 100 + 156 = 256 = 16²
x1 = (-10 - 16)/2 = -26/2 = -13 (on utilise les formules du cours)
x2 = (-10 + 16)/2 = 6/2 = 3
S = {-13 ; 3}