Răspuns :
a=-3
b=7
c=0
Δ=b²-4ac
Δ=7²-4*3*0
Δ=49
x1=-b+√Δ/2a
x1=-7+√49/2*3
x1=-7+7/6
x1=0/6
x1=0
x2=-b-√Δ/2a
x2=-7-√49/2*3
x2=-7-7/6
x2=-14/6
x2=-7/3
-3x²+7x=0⇒x(-3x+7)=0⇒
[tex]\Rightarrow x_1=0;\ \ x_2=\dfrac73[/tex]
[tex]\Rightarrow x_1=0;\ \ x_2=\dfrac73[/tex]