因数分解の公式（基礎）
\[ a^2 - 2ab + b^2 = (a-b)^2 \]
\[ a^2 - b^2 = (a+b)(a-b) \]
\[ x^2 + (a+b)x + ab = (x+a)(x+b) \]
\[ acx^2 + (ad+bc)x + bd = (ax+b)(cx+d) \]
\[ a^2+2ab+b^2 = (a+b)^2\]
\[ a^2 - 2ab + b^2 = (a-b)^2 \]
\[ a^2 - b^2 = (a+b)(a-b) \]
\[ x^2 + (a+b)x + ab = (x+a)(x+b) \]
\[ acx^2 + (ad+bc)x + bd = (ax+b)(cx+d) \]
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