## Solves the quadratic equation and draws the chart.

 $Quadratic\ equation\\\vspace{5}\hspace{30} ax^2+bx+c=0\\$

 a b c 6digit10digit14digit18digit22digit26digit30digit34digit38digit42digit46digit50digit
 $\normal(1)\ roots:\hspace{30} x_1={\large\frac{-b+\sqrt{b^2-4ac}}{2a}}\\\hspace{100} x_2={\large\frac{-b-\sqrt{b^2-4ac}}{2a}} \\\vspace{5}(2)\ double\ root:\ x={\large\frac{-b}{2a}}\ ,\qquad if\ b^2-4ac=0\\$

 [1-2] /2 Disp-Num5103050100200
[1]  2019/01/29 13:21   Male / Under 20 years old / Elementary school/ Junior high-school student / Very /
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homework
[2]  2018/10/19 17:08   Male / Under 20 years old / High-school/ University/ Grad student / Useful /
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time saving
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