Question Number 141730 by mathdanisur last updated on 22/May/21
$${x}^{\mathrm{2}} +{y}^{\mathrm{2}} +{xy}=\mathrm{9} \\ $$$${y}^{\mathrm{2}} +{z}^{\mathrm{2}} +{yz}=\mathrm{16} \\ $$$${x}^{\mathrm{2}} +{z}^{\mathrm{2}} +{xz}=\mathrm{25} \\ $$$${xy}+{yz}+{xz}=? \\ $$
Commented by mathdanisur last updated on 23/May/21
$${how}\:{sir} \\ $$
Commented by MJS_new last updated on 22/May/21
$$\mathrm{I}\:\mathrm{get}\:\pm\mathrm{8}\sqrt{\mathrm{3}} \\ $$