Here
the equation $$y^3=x^2+4$$ is mentioned which has only the solutions $(\pm2,2)$ and $(\pm11,5)$. I suggested to subtract $8$ and factorize to get $$(y-2)(y^2+2y+4)=(x-2)(x+2)$$
Can I prove only with modular arithmetic , quadratic residues and similar methods, that there are no more solutions ? Does my approach help ?