Show That $\sum _ { j = 1 } ^ { n } \left( j ^ { 3 } + j \right) \text { is } O \left( n ^ { 4 } \right)$

Show that $\sum _ { j = 1 } ^ { n } \left( j ^ { 3 } + j \right) \text { is } O \left( n ^ { 4 } \right)$