How to expand (x-1.95)(x-4)(x+7.98) in the Prime? - Printable Version +- HP Forums ( https://www.hpmuseum.org/forum)+-- Forum: HP Calculators (and very old HP Computers) ( /forum-3.html)+--- Forum: HP Prime ( /forum-5.html)+--- Thread: How to expand (x-1.95)(x-4)(x+7.98) in the Prime? ( /thread-6131.html) |

How to expand (x-1.95)(x-4)(x+7.98) in the Prime? - bigjohnson - 04-24-2016 03:42 PM
Hey guys, I'm having a problem expanding expressions involving decimal numbers. I type the expression (in CAS) then I put to simplify, but it doesn't. It returns the same expression, but if I do with natural numbers it does expand. For example, for (x-1.95)(x-4)(x+7.98) it should return x^3+2.03 x^2-39.681 x+62.244, but it doesn't, it returns the same input expression. But for example, if I type (x-1)(x-4)(x+7) and put to simlify, it does return the expanded form x^3+2 x^2-31 x+28 Does anyone know how to overcome this? Thanks a lot! RE: How to expand (x-1.95)(x-4)(x+7.98) in the Prime? - roadrunner - 04-24-2016 03:56 PM
Try: normal((x-1.95)*(x-4)*(x+7.98)) --> x^3+2.03*x^2-39.681*x+62.244 normal((x-1)*(x-4)*(x+7)) --> x^3+2*x^2-31*x+28 -road RE: How to expand (x-1.95)(x-4)(x+7.98) in the Prime? - DrD - 04-24-2016 03:58 PM
Did you try: expand((x-1.95)*(x-4)*(x+7.98)) ==> x^3+2.03*x^2-39.681*x+62.244 expand((x-1)*(x-4)*(x+7)) ==> x^3+2*x^2-31*x+28 -Dale- RE: How to expand (x-1.95)(x-4)(x+7.98) in the Prime? - Terje Vallestad - 04-24-2016 04:00 PM
(04-24-2016 03:42 PM)bigjohnson Wrote: Hey guys, I'm having a problem expanding expressions involving decimal numbers. If you use expand() as per your subject line you get the result you want. I.e. expand((x-1.95)*(x-4)*(x+7.98)) -> x^3+2.03 x^2-39.681 x+62.244 Cheers, Terje |