# x-2-y-x-2-1-3-2-1-

Question Number 204 by 02@>@0 last updated on 25/Jan/15
$${x}^{\mathrm{2}} +\left({y}−\sqrt[{\mathrm{3}}]{{x}^{\mathrm{2}} }\right)^{\mathrm{2}} =\mathrm{1} \\$$
Commented by 02@>@0 last updated on 15/Dec/14
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Answered by 02@>@0 last updated on 15/Dec/14
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Answered by 02@>@0 last updated on 15/Dec/14
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Answered by prakash jain last updated on 16/Dec/14
$$\mathrm{put}\:{x}^{\mathrm{2}} ={u}^{\mathrm{3}} \\$$$${u}^{\mathrm{3}} +\left({y}−{u}\right)^{\mathrm{2}} =\mathrm{1} \\$$$${u}^{\mathrm{3}} +{y}^{\mathrm{2}} −\mathrm{2}{uy}+{u}^{\mathrm{2}} =\mathrm{1} \\$$$${y}^{\mathrm{2}} −\mathrm{2}{uy}+\left({u}^{\mathrm{3}} +{u}^{\mathrm{2}} −\mathrm{1}\right)=\mathrm{0} \\$$$${y}=\frac{\mathrm{2}{u}\pm\sqrt{\mathrm{4}{u}^{\mathrm{2}} −\mathrm{4}\left({u}^{\mathrm{3}} +{u}^{\mathrm{2}} −\mathrm{1}\right)}}{\mathrm{2}} \\$$$${y}=\frac{\mathrm{2}{u}\pm\sqrt{\mathrm{4}−\mathrm{4}{u}^{\mathrm{3}} }}{\mathrm{2}}=\sqrt[{\mathrm{3}}]{{x}^{\mathrm{2}} }\pm\sqrt{\mathrm{1}−{x}^{\mathrm{2}} } \\$$
Commented by prakash jain last updated on 16/Dec/14
$$\mathrm{To}\:\mathrm{get}\:{x}\:\mathrm{in}\:\mathrm{terms}\:\mathrm{of}\:{y}\:\mathrm{solve}\:\mathrm{the}\:\mathrm{cubic}\:\mathrm{equation} \\$$$${u}^{\mathrm{3}} +{u}^{\mathrm{2}} −\mathrm{2}{uy}+\left({y}^{\mathrm{2}} −\mathrm{1}\right)=\mathrm{0} \\$$