Bonjour,
Résoudre:
ln(x+2)+ln(x)=ln(3)
ln (x+2)(x)) =ln(3)
ln(x²+2x)= ln (3)
x²+2x= 3
x²+2x-3= 0
Δ=2²-4(1)(-3)= 16 > 0
x1= (-2-4)/2= -6/2= -3
x2= (-2+4)/2= 2/2= 1
x2= 1, x∈ [ 0; + ∞ [
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Bonjour,
Résoudre:
ln(x+2)+ln(x)=ln(3)
ln (x+2)(x)) =ln(3)
ln(x²+2x)= ln (3)
x²+2x= 3
x²+2x-3= 0
Δ=2²-4(1)(-3)= 16 > 0
x1= (-2-4)/2= -6/2= -3
x2= (-2+4)/2= 2/2= 1
x2= 1, x∈ [ 0; + ∞ [