Mathematics
Senior High
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なぜ赤で書いたとこは、展開するとこの式になるのでしょうか?

33 x3+3x²+(a-4)x-a = a(x-1)+x3+3x²-4x = a(x-1)+x(x−1)(x+4) =(x-1)(x²+4x+a)

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