=(x-1)(x+2)(x-3)(x+4)+24(순서바꿈)=[(x-1)(x+2)],[(x-3)(x+4)]=(x²+x-2)(x²+x-12) +24,(x²+ x)를A로치환,전개A²-14A+48A,(x²+ x)대입=(x²+x-6)(x²+x-8)
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