Помогите дам 20 балов

Решите задачу:

$\left \{ {{x^2+q^2=29} \atop {x^2-q^2=21}} \right. \\ \left \{ {{x^2=29-q^2} \atop {29-q^2-q^2=21}} \right. \\ \left \{ {{x^2=29-q^2} \atop {q^2=4}} \right. \\ \left \{ {{q^2=4} \atop {x^2=25}} \right. \\ \left \{ {{x_{1}=2 } \atop { q_{1}=5}} \right. \left \{ {{x_{2}=-2 } \atop { q_{2}=-5}} \right. \left \{ {{x_{3}=2 } \atop { q_{3}=-5}} \right. \left \{ {{x_{4}=-2 } \atop { q_{4}=5}} \right.$