$\definecolor{red}{RGB}{255,0,0}$$\definecolor{black}{RGB}{0,0,0}$
$a$
$a$
$a$
$$\color{blue}{\rightarrow}\color{black}\;a \;= \;\frac{q}{x_1\cdot x_2}$$
$b$
$b$
$b$
$$\color{blue}{\rightarrow}\color{black}\;b \;= \;-\frac{q(x_1+x_2)}{x_1\cdot x_2}$$
$c$
$c$
$c$
$$\color{blue}{\rightarrow}\color{black}\;c \;= \;q$$
$x_1$
$x_1$
$x_1$
$x_2$
$x_2$
$x_2$
$q$
$q$
$g$
equation
equation
equation
$$\color{blue}{\rightarrow}\color{black}\;y=\frac{q}{x_1\cdot x_2}\cdot x^2-\frac{q(x_1+x_2)}{x_1\cdot x_2}\cdot x+q $$
Equation of the parabola from the intersection with the axes
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