minthao_2011
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 Jun 24 comment How do I calculate the area of a polygon given its coordinates? when I tried pts = {{5, 2}, {4, 1}, {1, 3}}; GraphicsMeshMeshInit[]; PolygonArea[pts] I got -2.5. I don't understand. Jun 24 comment How do I obtain the enclosed area of this particular parametric plot? I tried pts = {{5, 2}, {4, 1}, {1, 3}}; GraphicsMeshMeshInit[]; PolygonArea[pts] but I received -2.5 Jun 23 comment How can I get the exact real solution of this equation? Jun 23 comment How can I get the exact real solution of this equation? I am a teacher. When I teach for my students, in this case, when we solve by hand, we always conclude the given solution has only real solution (solve in real domain). Am I wrong? Jun 23 comment How can I get the exact real solution of this equation? Thank you very much for your answers and your helps. Jun 23 comment How can I get the exact real solution of this equation? Perhaps about my English, therefore my question is not clearly. My question is "How many solutions when I solve the equation Sqrt[x] + Sqrt[1 - x^2] == Sqrt[2 - 3 x - 4 x^2] in the real domain? Jun 23 comment How can I get the exact real solution of this equation? I have just online. Thank you four your answer. Jun 23 accepted How can I get the exact real solution of this equation? Jun 23 comment How can I get the exact real solution of this equation? I used Solve[Sqrt[x] + Sqrt[1 - x^2] == Sqrt[2 - 3 x - 4 x^2], x, Reals] // ToRadicals, then I got one real solution. Jun 23 comment How can I get the exact real solution of this equation? @MichaelE2 I use Solve[Sqrt[x] + Sqrt[1 - x^2] == Sqrt[2 - 3 x - 4 x^2], x, Reals] // ToRadicals and received one real solution. Thank you. Jun 23 revised How can I get the exact real solution of this equation? added 109 characters in body Jun 23 comment How can I get the exact real solution of this equation? @Artes With Maple, I received one real solution. For me, the given equation has only one real solution. Jun 23 comment How can I get the exact real solution of this equation? @belisarius and @Algohi, with -1 - Sqrt[2], the Sqrt[-1 - Sqrt[2]]is not identified. Jun 23 asked How can I get the exact real solution of this equation? May 26 awarded Civic Duty Apr 11 revised How can I select two lists from a list of lists so that I receive the system of equations has only rational solutions? added 1 characters in body; edited title Apr 11 asked How can I select two lists from a list of lists so that I receive the system of equations has only rational solutions? Mar 23 accepted Reduce with Integer domain, but receive a rational solution Mar 6 comment How to find the complex number has least and greatest modul satisfying a given condition? No. But I think, the solution does not exactly. Mar 5 accepted How to find the complex number has least and greatest modul satisfying a given condition?