今回は2次方程式の判別式。
判別式
英語で判別式は、Discriminant (ディスクリミナント)
意外にみんな知らない。。
実際に判別すると
なら2つのreal solutions(実数解)
なら1つのreal solution
なら0個のreal solution
ということで、例えば
Since the discriminant is greater than 0, the quadratic equation has two real solutions.
(判別式D>0なので、この二次方程式は2つの実数解を持つ。)
とか言える。
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