a) 3x(x-1)+4x-4=0=>
3x^2-3x+4x-4=0=>
3x^2+x-4
Delta=1+48=49
X1=(-1+7)/6=1
X2=(-1-7)/6=-4/3
B) (x-2)(x+2)=3x=>
X^2-3x-4=0
Delta=9+16=25
X1=(3+5)/2=4
X2=(3-5)/2=-1
C) 2x(x+1)-x(x+4)-3=0=>
2x^2+2x-x^2-4x-3=0=>
x^2-2x-3=0
Delta=4+12=16
X1=(2+4)/2=3
X2=(2-4)/2=-1
D)4x(x+2)=2(4x-3)=>
4x^2+8x=8x-6=>
4x^2-6=0