minthao_2011
Reputation
1,674
Next privilege 2,000 Rep.
 Jul16 revised Is this a bug in FunctionDomain (V.10)? added 101 characters in body Jul16 accepted Is this a bug in FunctionDomain (V.10)? Jul16 asked Is this a bug in FunctionDomain (V.10)? Jul2 awarded Inquisitive Jul2 awarded Curious Jun24 comment How do I calculate the area of a polygon given its coordinates? Thank you very much. Jun24 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. Jun24 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 Jun23 comment How can I get the exact real solution of this equation? Jun23 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? Jun23 comment How can I get the exact real solution of this equation? Thank you very much for your answers and your helps. Jun23 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? Jun23 comment How can I get the exact real solution of this equation? I have just online. Thank you four your answer. Jun23 accepted How can I get the exact real solution of this equation? Jun23 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. Jun23 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. Jun23 revised How can I get the exact real solution of this equation? added 109 characters in body Jun23 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. Jun23 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. Jun23 asked How can I get the exact real solution of this equation?