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+--- Thread: Squaring the Binomial (/thread-16991.html)
Squaring the Binomial - MullenJohn - 05-22-2021 03:54 PM
Help,
Using my HP Prime calculator I am try to square the binomial (12*c^4 + 0.25*a^6*c)^2.
I was expecting something like (a^2 + B^2 + c) but I am getting only a number like 2.9887...
Please tell me how to expand the binomial with just the literals.
Thanks - Cheers!
RE: Squaring the Binomial - Joe Horn - 05-22-2021 04:37 PM
(05-22-2021 03:54 PM)MullenJohn Wrote: Help,
Using my HP Prime calculator I am try to square the binomial (12*c^4 + 0.25*a^6*c)^2.
I was expecting something like (a^2 + B^2 + c) but I am getting only a number like 2.9887...
Please tell me how to expand the binomial with just the literals.
Thanks - Cheers!
Your variables might have values assigned to them. Purging them will force Prime to use them symbolically. Try purge(c) or del(c), and then try your simplification again.
Suggestion: Any time CAS sees a decimal point, it flips from "Exact" mode into "Approximate" mode. To use CAS to its full potential, avoid including any decimal points in CAS. E.g. use 1/4 instead of 0.25.
RE: Squaring the Binomial - Albert Chan - 05-22-2021 05:40 PM
Instead of purging variables, we can quote them. (quote(expr) == 'expr')
Quoting returns its argument unevaluated.
Cas> a:=b:=c:=1
Cas> expand('(12*c^4 + 1/4*a^6*c)^2')
1/16*a^12*c^2+6*a^6*c^5+144*c^8
---
BUG report: sometimes quoting does not work.
HP Prime emulator 2.1.14181 (2018 10 16):
Cas> expand('(12*c^4 + 1/4*a^6*c)^2')
150.0625
Not only quote not working, results somehow turned approximate.