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x^2=b^2+c^2
17^2=15^2+a^2
289-225=a^2
64=a^2
√64=a
8=a
Eso es todo..Salu2
a²+15²=17²
a²+225=289
a²=289-225
a²=64
a=√64
a=8
:) Listo!...