x²-y²+4y-4
= x²-(y²-4y+4)
2乗の展開公式
= x²-(y-2)²
2乗-2乗の公式
= {x+(y-2)}{x-(y-2)}
= (x+y-2)(x-y+2)
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x²-y²+4y-4
= x²-(y²-4y+4)
2乗の展開公式
= x²-(y-2)²
2乗-2乗の公式
= {x+(y-2)}{x-(y-2)}
= (x+y-2)(x-y+2)
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are also looking at these questions 😉
4x²-4y²+4y-1
= 4x²-(4y²-4y+1)
2乗の展開公式
= 4x²-(2y-1)²
2乗-2乗の公式
= {2x+(2y-1)}{2x-(2y-1)}
= (2x+2y-1)(2x-2y+1)