Solving Partial Fractions with complex denominator roots

[MarcosLima]

Hello,

I'm trying to solve a partial fraction with a complex denominator roots, i've tried to use the comand "partfrac", but it doesn't work for complex roots.

Example:

the roots of (s^2+4s+5) are [-2-i, -2+i],

If there is any comand that helps me solve this.

Thanks,

Marcos

[Maké]

Hi!, @MarcosLima:

Please, from Options --> Edit Replay, delete the serial Number (S/N), what you write.

See, with Wolfram Alpha the result, of complex roots ... https://www.wolframalpha.com/input/?i=F(s)%3D+(s%2B3)%2F(s%2B5)*(s%5E2%2B4s%2B5)

[Jan_D]

Hello MarcosLima,

What calculator are you talking about?

The code 9CJ72103J8 that you gave is not very helpful.

[MarcosLima]

Hello,
the calculator is hp prime

Thanks,
Marcos

[Maké]

Please, delete the Serial Number (S/N) what you indicate, as model, from ... Options --> Edit Reply

For your questions, you can use ...

[Jan_D]

---

@MarcosLima wrote:

Hello,

I'm trying to solve a partial fraction with a complex denominator roots, i've tried to use the comand "partfrac", but it doesn't work for complex roots.

---

It does work but you have to change the CAS setting by checking "Use i".

Then you get the result you want:

g

EDIT

I see that you also can use cpartfrac without changing the CAS settings.

[Maké]

By default configuration, the HP PRIME GRAPHING CALCULATOR have, in Home Settings in Complex ... a+b*i.

You don't need to change anything.