Question

x²= 5²+ 12² teorema de pitagoras

Answer 1

$x^{2} =5 ^{2} +12 ^{2} \\ x^{2} =25+144\\x= \sqrt{169}\\ x=13$

Answer 2

$x^{2} =5^2+12^2\to\\\\ x^{2} =25+144\to\\\\ x^{2} =169\to\\\\ x= \sqrt{169} \to\\\\ \boxed{x=13}$