Question

Z=$\sqrt{R^{2}+X^{2} }$. Найти R

Answer 1

$Z=\sqrt{R^{2}+X^{2}} \\\\R^{2}+X^{2}=Z^{2}\\\\R^{2}=Z^{2}-X^{2}\\\\R=\sqrt{Z^{2}-X^{2}}$

Answer 2

Z=√(R²+X²)

Z²=R²+X²

R²=Z²-X²

R=√((Z-X)(Z+X))