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x2-16=0
x2=16
x=-4 of x=4
x2+2x=0
x(x+2)=0
x=0 of x+2=0
x=0 of x=-2 3x2-6=12
3x2=18
x2=6
$
x = -\sqrt 6 \,\,of\,\,x = \sqrt 6
$
2x(4x+2)=0
2x=0 of 4x+2=0
x=0 of 4x=-2
x=0 of x=$-\frac{1}{2}$ x2+4x+3=0
(x+1)(x+3)=0
x+1=0 of x+3=0
x=-1 of x=-3
x2-6x-16=0
(x-8)(x+2)=0
x-8=0 of x+2=0
x=8 of x=-2 x2+4x-12=0
(x-2)(x+6)=0
x-2=0 of x+6=0
x=2 of x=-6
3x2-6x+3=0
x2-2x+1=0
(x-1)2=0
x-1=0
x=1 x2=x
x2-x=0
x(x-1)=0
x=0 of x-1=0
x=0 of x=1
(x+2)2=4x+4
x2+4x+4=4x+4
x2=0
x=0 x2-3x+2=x-1
x2-4x+3=0
(x-3)(x-1)=0
x-3=0 of x-1=0
x=3 of x=1
3x2-4x=2x(x-1)
3x2-4x=2x2-2x
x2-2x=0
x(x-2)=0
x=0 of x-2=0
x=0 of x=2

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