Question 1051558
{{{(1/5)*r^(3/2)+(5/2)*r^(1/2)}}}=0

{{{(2)*r^(3/2)+(25)*r^(1/2)}}}=0

{{{(2)*S^(3)+(25)*S}}}=0

{{{S((2)*S^(2)+(25))}}}=0

first case s=0 meaning r=0
{{{(2)*S^(2)+(25)}}}=0

*[invoke quadratic "S", 2, 0, 25 ]