Calculadora Formas Cuadraticas

\( x_{1}^2 \) \(+\) \( x_{1} x_{2} \) \(+\) \( x_{1} x_{3} \) \(+\)
\( x_{2}^2 \) \(+\) \( x_{2} x_{3} \) \(+\)
\( x_{3}^2 \)