x^2-4=0 x^2-2x-3=0 x^2+4x+3=0

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x^2-4=0x^2-2x-3=0x^2+4x+3=0x^2-4=0x^2-2x-3=0x^2+4x+3=0x^2-4=0x^2-2x-3=0x^2+4x+3=0x^2-4=0(x+2)(x-2)=0

x^2-4=0 x^2-2x-3=0 x^2+4x+3=0
x^2-4=0 x^2-2x-3=0 x^2+4x+3=0

x^2-4=0 x^2-2x-3=0 x^2+4x+3=0
x^2-4=0
(x+2)(x-2)=0
x=-2,x=2
x^2-2x-3=0
(x+1)(x-3)=0
x=-1,x=3
x^2+4x+3=0
(x+1)(x+3)=0
x=-1,x=-3

x^2-4=0
x= ±2
x^2-2x-3=0
x-3) ( x+1)
x=3或者-1

x^2+4x+3=0
x+3) (x+1)
x=-1或者-3