What is the Ultraradical The ultraradical, or the Bring radical, of a real number \$a\$ is defined as the only real root of the quintic equation \$x^5+x+a=0\$. Here we use \$UR(\cdot)\$ to denote the ultraradical function. For example, \$UR(-100010)=10\$, since \$10^5+10-100010=0\$. Challenge ...