Answer:
x = √39
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
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