Question 651632
{{{sqrt(y^3) - 7y = 0}}}
{{{y(sqrt(y) - 7) = 0}}}
y =0 is one solution.
{{{sqrt(y) -7  = 0}}}
{{{sqrt(y) = 7}}}
{{{sqrt(y)^2 = 7^2}}}
{{{y = 49}}}

The two solutions are 0 and 49.