Salut!
3x²+10x+3=0
a=3
b=10
c=3
Δ=b²-4ac
Δ=10²-4x3x3
Δ=100-36
Δ=64
X₁₋₂= -b±√Δ/2a
X₁=-10+8/6 = -2/6 = -1/3
X₂= -10-8/6 = -18/6 = -3
Succes!
3X×X+10X+3=0
3X²+10X+3=0
3X²+9X+X+3=0
3X(X+3)+X+3=0
(3X+1)×(X+3)=0
