1,485 reputation
1419
bio website
location
age
visits member for 1 year, 11 months
seen 2 days ago

6h
awarded  Nice Question
Aug
4
awarded  Popular Question
Jul
17
comment Is this a bug in FunctionDomain (V.10)?
Mclure First, thanks to your answer. I think, we want to find the domain of the given function, we must solve the inequality x^3+1<>0.
Jul
16
revised Is this a bug in FunctionDomain (V.10)?
added 106 characters in body
Jul
16
revised Is this a bug in FunctionDomain (V.10)?
added 101 characters in body
Jul
16
accepted Is this a bug in FunctionDomain (V.10)?
Jul
16
asked Is this a bug in FunctionDomain (V.10)?
Jul
2
awarded  Inquisitive
Jul
2
awarded  Curious
Jun
24
comment How do I calculate the area of a polygon given its coordinates?
Thank you very much.
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}}; Graphics`Mesh`MeshInit[]; 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}}; GraphicsMesh`MeshInit[]; PolygonArea[pts]` but I received -2.5
Jun
23
comment How can I get the exact real solution of this equation?
Let us continue this discussion in chat.
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.