How to factorize this polynomial

08232022, 12:02 PM
Post: #1




How to factorize this polynomial
Hi all, I am learning math and learning how to use the HP Prime as well.
How do I factorize 4x^2+36xy+81y^2 and get (2x+9y)^2 as a result? Things I've tried in CAS view:  factor(4x^2+36xy+81y^2) > 36xy+4x^2+81y^2  factors(4x^2+36xy+81y^2) > [4*x^2+81*y^2+36*xy,1]  simplify(4x^2+36xy+81y^2) > 4x^2+36xy+81y^2  collect(4x^2+36xy+81y^2) > 4x^2+81y^2+36xy  cfactor(4x^2+36xy+81y^2) > 4x^2+81y^2+36xy 

08232022, 05:16 PM
Post: #2




RE: How to factorize this polynomial
(08232022 12:02 PM)rancom Wrote: Hi all, I am learning math and learning how to use the HP Prime as well. You have to put the multiplication sign between the numbers, the variable "x" and the variable "y". 

08232022, 05:16 PM
Post: #3




RE: How to factorize this polynomial
Add a * between x and y, otherwise xy is interpreted as a single variable with a name identifier of length 2.


08232022, 05:17 PM
Post: #4




RE: How to factorize this polynomial
(08232022 05:16 PM)robmio Wrote: [quote='rancom' pid='163314' dateline='1661256139'] You have to put the multiplication sign between the numbers, the variable "x" and the variable "y". 

08232022, 05:30 PM
(This post was last modified: 08232022 05:31 PM by Steve Simpkin.)
Post: #5




RE: How to factorize this polynomial
(08232022 05:16 PM)robmio Wrote:(08232022 12:02 PM)rancom Wrote: Hi all, I am learning math and learning how to use the HP Prime as well. I don't believe you have to put a multiplication symbol between a number and its variable when entering the equation. For example entering; factor(4x^2+36x*y+81y^2) appears to be automatically interpreted as factor(4*x^2+36x*y+81*y^2) without having to enter the * after the 4, 36 or 81. 

08232022, 05:35 PM
Post: #6




RE: How to factorize this polynomial
(08232022 05:30 PM)Steve Simpkin Wrote:(08232022 05:16 PM)robmio Wrote: You have to put the multiplication sign between the numbers, the variable "x" and the variable "y". Wow, I didn't know. Thank you so much for letting me know this possibility. Regards, Roberto 

08232022, 05:48 PM
Post: #7




RE: How to factorize this polynomial
It's beginning to look like Facebook here fellas, 1 or 2 of the same answers are probably enough... LOL
Bob Prosperi 

08232022, 10:35 PM
Post: #8




RE: How to factorize this polynomial
(08232022 05:48 PM)rprosperi Wrote: It's beginning to look like Facebook here fellas, 1 or 2 of the same answers are probably enough... LOL Oh, go put a multiplication sign in that! I know that answers don't show up immediately for me so sometimes I answer a question that's been answered two or three times (or more!) before I see them. Tom L Cui bono? 

08242022, 07:48 AM
Post: #9




RE: How to factorize this polynomial  
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