$\definecolor{red}{RGB}{255,0,0}$$\definecolor{black}{RGB}{0,0,0}$
$a$
$a$
$a$
$$\color{blue}{\rightarrow}\color{black}\;a \;= \;-\frac{4\cdot d}{(x_1- x_2)^2}$$
$b$
$b$
$b$
$$\color{blue}{\rightarrow}\color{black}\;b \;= \;\frac{4\cdot d(x_1+ x_2)}{(x_1- x_2)^2}$$
$c$
$c$
$c$
$$\color{blue}{\rightarrow}\color{black}\;c \;= \;-\frac{4\cdot d\cdot x_1\cdot x_2}{(x_1- x_2)^2}$$
$x_1$
$x_1$
$x_1$
$x_2$
$x_2$
$x_2$
$d$
$d$
$d$
equation
equation
equation
$$\color{blue}{\rightarrow}\color{black}\;y=-\frac{4\cdot d}{(x_1- x_2)^2}x^2+\frac{4\cdot d(x_1+ x_2)}{(x_1- x_2)^2}x-\frac{4\cdot d\cdot x_1\cdot x_2}{(x_1- x_2)^2}$$
1-
Equation of the parabola from the intersection with the x-axis and the top ordinate
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