[tex]a) x^{2} +2^{2} =8^{2} \\ x^{2} +4=64\\x^{2} =60\\x =\sqrt{60} \\x=2\sqrt{15} \\b)5^{2} +\sqrt{2}^{2} =x^{2} \\25+2=x^{2} \\x^{2} =27\\x=\sqrt{27}\\ x=3\sqrt{3}[/tex]
