Please no links will mark brainiest for compleat answer.
question is in pic below

Answer:
[tex]16x^{10}[/tex]
Step-by-step explanation:
Area of a square = [tex]s^{2}[/tex]
[tex]s=4x^{5}[/tex]
[tex]s^{2} =(4x^{5} )^{2}[/tex]
[tex]s^{2} =16x^{10}[/tex]