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5は平方完成をつかう。
2を右辺に移行して、x^2+4x=-2
そして両辺に4を足す。x^2+4x+4=-2+4
(x+2)^2=2
x+2=±√2
x=-2±√2
6は解の公式を使い、
x=-2±√4+12/6
=-2±4/6
x=1/3、-1
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