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Solutia numarului natural 25 -x la patrat =0 este...??

Răspuns :

[tex]25-x^2=0 \\ (5-x)(5+x)=0 \\ \\ 5-x=0 \rightarrow x=5 \\ 5+x=0 \rightarrow x=-5 \\ x \in \mathbb{N} \longrightarrow \boxed{x=5}[/tex]