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Finding roots of polynomial
02-26-2022, 03:47 PM
Post: #1
Finding roots of polynomial
Hi there,

I am reading the hp prime user guide.

On page 55, there is an example to find the roots of 2x^2+3x-2.

I do as the manual says, proot(2*x^2+3*x-2) and the hp prime answers []

Inside the braclets there is no info about the 2 roots.

Note: the ^inside the proot(2*x^2+3*x-2) , I dont input it in the hp prime.

What am I doing wrong??

Many thanks,
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02-26-2022, 11:01 PM
Post: #2
RE: Finding roots of polynomial
proot() is expecting an array of coefficients for the input polynomial. So, for your polynomial

proot( [2 3 -2] )

and hp prime's answer
[-2.,0.5]

ter
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02-26-2022, 11:22 PM
Post: #3
RE: Finding roots of polynomial
The example with the polynomial worked for me. Until I assigned a value to x. Now I get an empty matrix for an answer.

Trying to remember how to unassign a variable in CAS. :^(

513016415223221833242338122322514610315
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02-27-2022, 12:18 AM
Post: #4
RE: Finding roots of polynomial
purge(x)

513016415223221833242338122322514610315
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02-27-2022, 08:53 AM
Post: #5
RE: Finding roots of polynomial
Hi there,

After doing purge(x), it worked fine.

I was begining to think the calc had a bug....

Many thanks!
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