x(x+1)-x-9=0
x²+x-x-9=0
x²-9=0
(x-3)(x+3)=0
x=3或x=-3
x²-2x=224
x²-2x-224=0
(x-16)(x+14)=0
x=16或x=-14
x(x-2)=2(2-x)
x(x-2)-2(2-x) =0
x(x-2)+2(x-2) =0
(x-2)(x+2)=0
x=2或x=-2
x²-[2√2+3√3]x+6√6=0
(x-2√2)(x-3√3)=0
x=2√2或x=3√3
4x²+1=4x
4x²+1-4x=0
(2x-1)²=0
x=1/2
(x-3)²+2x(x-3)=0
(x-3)[(x-3)+2x]=0
(x-3)(3x-3)=0
3(x-3)(x-1)=0
(x-3)(x-1)=0
x=3或x=1
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