1. $a$
2. $a$
4. $a$

5. $$\color{blue}{\rightarrow}\color{black}\;a \;= \;-\frac{4\cdot d}{(x_1- x_2)^2}$$

1. $b$
2. $b$
4. $b$

5. $$\color{blue}{\rightarrow}\color{black}\;b \;= \;\frac{4\cdot d(x_1+ x_2)}{(x_1- x_2)^2}$$

1. $c$
2. $c$
4. $c$

5. $$\color{blue}{\rightarrow}\color{black}\;c \;= \;-\frac{4\cdot d\cdot x_1\cdot x_2}{(x_1- x_2)^2}$$

1. $x_1$
2. $x_1$
4. $x_1$

1. $x_2$
2. $x_2$
4. $x_2$

1. $d$
2. $d$
4. $d$

1. équation
2. équation
4. équation

5. $$\color{blue}{\rightarrow}\color{black}\;y=-\frac{4\cdot d}{(x_1- x_2)^2}x^2+\frac{4\cdot d(x_1+ x_2)}{(x_1- x_2)^2}x-\frac{4\cdot d\cdot x_1\cdot x_2}{(x_1- x_2)^2}$$

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Numbers in the form 1/2 or 0.5 are accepted:

Matrix A:

Vector v: