Question 367307
{{{ x+3sqrt(x)-40=0 }}},
{{{(sqrt(x)-5)(sqrt(x)+8) = 0}}}.
Hence {{{sqrt(x) = 5}}}, or {{{sqrt(x) = -8}}}.  
The second equation has no solution (extraneous solution!), while the first gives x = 25.  This also satisfies the original equation, so this is the final answer.