Mathematics
Senior High
高一数学因数分解です
矢印ところでなぜこの式になるのかが分かりません💦
教えてください🙏
7 (1) (5x)=(x-1)(x-7)x(x-3)(x-5)-9
=(x²-8x+7)(x²-8x+15)-9
5
=(x²-8x)² +22(x²-8x) +96
=(x²-8x+6)(x²-8x+16)
= (x²-8x+6)(x-4)²
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