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x-2-xy-y-3-3-25-y-2-3-z-2-9-z-2-zx-x-2-16-so-xy-2yz-3zx-




Question Number 95898 by rb222 last updated on 28/May/20
x^2 +xy+(y^3 /3)=25  (y^2 /3)+z^2 =9  z^2 +zx+x^2 =16  so xy+2yz+3zx=?
$${x}^{\mathrm{2}} +{xy}+\frac{{y}^{\mathrm{3}} }{\mathrm{3}}=\mathrm{25} \\ $$$$\frac{{y}^{\mathrm{2}} }{\mathrm{3}}+{z}^{\mathrm{2}} =\mathrm{9} \\ $$$${z}^{\mathrm{2}} +{zx}+{x}^{\mathrm{2}} =\mathrm{16} \\ $$$${so}\:{xy}+\mathrm{2}{yz}+\mathrm{3}{zx}=? \\ $$

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