Question Number 168248 by mathlove last updated on 07/Apr/22
Commented by MJS_new last updated on 07/Apr/22
$$\mathrm{6}^{\mathrm{4}} >\mathrm{405}\:\Rightarrow\:{x}<\mathrm{4} \\ $$$$\mathrm{trying}\:{x}=\mathrm{1},\:\mathrm{2},\:\mathrm{3}\:\Rightarrow \\ $$$${x}=\mathrm{3} \\ $$