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jabbapav Honor Student
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Solving Problem

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Hello

 

My HP Prime Graphing Calculator solves solve(x^3+e^x - 1 = 0,x) WRONG.

I dont know the problem but the solution is "x=0".

 

Does anybody know how to solve this problem? 

1.jpeg2.jpeg

 

 

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Distinguished Professor
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Hi!, @Jabbapav :

With the Wolfram Alpha, the result is ...

Wolfram_1.JPG 

In the HP PRIME ...

1) Select the option Apps Solve ...

Solve_12.JPG

Now, write the equation ...

Solve_13.JPG 

Press ... Num.JPG

The result, is same what Wolfram Alpha and is = 0.

If press, Solve, you can obtein the result.

Cero.JPG

 

 


You're Welcome !.
Best wishes and regards.
@Maké (Voluntary and "ad honorem").
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Please, mark Accept As Solution if it solves your problem.
jabbapav Honor Student
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What happens if there is more than 0 Solution for X/Y? 

 

For Example: 

f1: 3x^2 + 12y

f2: 12x + 24y^2

 

Solution: (0,0) & (-2,-1)

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Distinguished Professor
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Hi!, @Jabbapav :

You can see, this video ... https://www.youtube.com/watch?v=K_MAnrWSrgQ


You're Welcome !.
Best wishes and regards.
@Maké (Voluntary and "ad honorem").
Click the White thumb to say thanks.
Please, mark Accept As Solution if it solves your problem.
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jabbapav Honor Student
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Thx

I know what u mean. But i mean if there is more than only 1 solution for x/y like my example.

How can i show all answers and not only one solution

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Distinguished Professor
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Hi!, @Jabbapav :

Note : The result what you indicate, only represent, the real root's, of the equation's.


You're Welcome !.
Best wishes and regards.
@Maké (Voluntary and "ad honorem").
Click the White thumb to say thanks.
Please, mark Accept As Solution if it solves your problem.
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Teacher
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When solve switches to fsolve and I get a near zero result (such as a 1E-15), I try to encourage the solver. 

 

I often try setting a guess or interval using the notation  x=guess or min..max, or I try to set the iterative algorithm (method).  The fsolve help has more info.

 

fsolve((x^3+e^x-1) = 0,x = 0) ---> 0

fsolve((x^3+e^x-1) = 0,x,newton_solver)  ---> 0

 

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