b) 3x^2+4x-4=0
delta = 16+48=64
x₁=(-4+8)/2=2
x₂=(-4-8)/2=-6
c) -9x^2-6x-1=0
delta=36-36=0
x₁=x₂=6/-18=-1/3
d)2(x-1)^2=3x+2
2x^2-4x+2=3x+2
2x^2-7x=0
delta = 49
x₁=(7+7)/4=7/2
x₂=(7-7)/4=0
e)(x-2)(x-3)=24
x^2-2x-3x+6=24
x^2-5x-18=0
delta= 25+72=97
x₁=(5+√97)/2
x₂=(5-√97)/2
f) (x-3)(x+2)=14
x^2-3x+2x-6=14
x^2-x-20=0
delta =1+80=81
x₁=(1+9)/2=5
x₂=(1-9)/2=-4
