Squaring the Binomial

05222021, 03:54 PM
Post: #1




Squaring the Binomial
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! 

05222021, 04:37 PM
Post: #2




RE: Squaring the Binomial
(05222021 03:54 PM)MullenJohn Wrote: Help, 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. <0ΙΈ0> Joe 

05222021, 05:40 PM
Post: #3




RE: Squaring the Binomial
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. 

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