(x-1)^2-(x+3)(x-3)= x^2-2x+1-(x^2-9)=x^2-x^2-2x+1+9=-2x+10.
(x-1)^2-(x+3)(x-3)=x^2-2x+1-(x^2-9)=-2x+10=-2(x-5)
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(x-1)^2-(x+3)(x-3)= x^2-2x+1-(x^2-9)=x^2-x^2-2x+1+9=-2x+10.
(x-1)^2-(x+3)(x-3)=x^2-2x+1-(x^2-9)=-2x+10=-2(x-5)