Question Number 191126 by Mingma last updated on 18/Apr/23
Commented by mahdipoor last updated on 18/Apr/23
$$\mathrm{4}^{\mathrm{2}} +\mathrm{3}^{\mathrm{2}} +\mathrm{2}^{\mathrm{2}} +\mathrm{1}^{\mathrm{2}} −\frac{\mathrm{4}\left(\mathrm{4}+\mathrm{3}+\mathrm{2}+\mathrm{1}\right)}{\mathrm{2}} \\ $$