Question Number 191732 by Spillover last updated on 29/Apr/23
$${Find}\:{the}\:{relative}\:{maximum}\:{and}\:{minimum} \\ $$$${of}\:{the}\:{function} \\ $$$${f}\left({x},{y}\right)=\mathrm{x}^{\mathrm{3}} +\mathrm{y}^{\mathrm{3}} −\mathrm{3x}−\mathrm{12y}+\mathrm{20} \\ $$