Respuesta :

Answer:

x = √39

Step-by-step explanation:

both triangles have one same side, which can be called y

so y^2 = 10^2 - 6^2

and y^2 = x^2 + 5^2

then x^2 + 5^2 = 10^2 - 6^2

x^2 = 100 - 36 - 25 = 39

x = √39

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