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+--- Thread: (1-10x)^4 does not expand (/thread-12779.html)
(1-10x)^4 does not expand - MullenJohn - 04-10-2019 06:29 PM
Help, In HOME with HP Prime,
I enter (1-10x)^4 and expect something like #x^4+#x^3+#x^2+#x+c where # is any number.
However my result is (1.-10x)^4 which is just what I started with.
How do I get the binomial raised to the 4th power to expand?
Thanks - Cheers!
RE: (1-10x)^4 does not expand - Aries - 04-10-2019 06:45 PM
Hi,
expand is an algebric CAS command, you can use it for polynomials and rational functions (powexpand for expressions with exponents and texpand for transcendent functions)
Best,
Aries
RE: (1-10x)^4 does not expand - MullenJohn - 04-10-2019 06:59 PM
Aries, Thank you for your reply.
I am still confused.
Are you saying that I cannot directly input (1-10x)^4 in the HOME textbox and get the expansion.
Are you saying I must use the powexpand command in the CAS textbox to get the expansion?
Cheers!
RE: (1-10x)^4 does not expand - Aries - 04-10-2019 07:13 PM
Try CAS.expand('expression') or CAS.expand('expression','variable') in HOME mode
Algebric objects need single quotes.
Best,
Aries
RE: (1-10x)^4 does not expand - DrD - 04-10-2019 07:57 PM
Either of these should work:
[HOME]
CAS("expand((1-10*x)^4)");
CAS.expand("(1-10*x)^4");
Note the multiplication sign at 10*x, to avoid implicit multiplication issues.
RE: (1-10x)^4 does not expand - MullenJohn - 04-10-2019 08:26 PM
Aries & DrD,
Thank you for replies. It is clear to me now. Cheers!
RE: (1-10x)^4 does not expand - Aries - 04-11-2019 06:21 AM
Dont mention it !
Best,
Aries