12-(x-x^2)(8-x-x^2) factorise
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12-(x+x^2)(8-x-x^2)=12-8(x-x^2)+(x+x^2)^2
=(x+x^2-2)(x+x^2-6)
=(x-2)(x+2)(x-2)(x+3)
finally =(x+x^2)(8-x-^2)=(x-2)(x+2)(x-2)(x+3)
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