Tìm x: x(3 - 2x) + 2x^2 = 12

Bài1:Tìm x
a,x(3-2x)+2x^2=12
b,x(x-3)-x+3=0
c,x^3-3x^2+3x-4=0
d,(3x-1)^2-x^2+2x-1=0