مقدار خواسته شده را بیابید.
\(4\sqrt 3 \)
7
\(5\sqrt 2 \)
\(\sqrt {51} \)
\(\begin{array}{l}{y^2} = {4^2} + {\left( {\sqrt {15} } \right)^2} = 16 + 15\,\, = 31\,\, \Rightarrow \,\,y = \sqrt {31} \\\\\\{x^2} = {y^2} + {\left( {\sqrt {19} } \right)^2} = {\left( {\sqrt {31} } \right)^2} + 19 = 31 + 19\\\\ = 50 = 25 \times 2\,\, \Rightarrow \,\,x = 5\sqrt 2 \end{array}\)