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! a ＞ 0 のとき
| [[File:Number of real solutions of quadratic equation D)0 a)0.svg|thumb|center|150px]] || [[File:Number of real solutions of quadratic equation D=0 a)0.svg|thumb|center|150px]] || [[File:Number of real solutions of quadratic equation D(0 a)0.svg|thumb|center|150px]]
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! a ＜ 0 のとき
| [[File:Number of real solutions of quadratic equation D)0 a(0.svg|thumb|center|150px]] || [[File:Number of real solutions of quadratic equation D=0 a(0.svg|thumb|center|150px]] || [[File:Number of real solutions of quadratic equation D(0 a(0.svg|thumb|center|150px]]
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! 共有点の個数
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