Answer:
x=5
Step-by-step explanation:
[tex] {x}^{2} + {12}^{2} = {13}^{2} = > {x}^{2} + 144 = 169 = > {x}^{2} = 169 - 144 = > {x}^{2} = 25 = > x = 5[/tex]
