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For me, this is the best method to solve (better than completing squares, general quadratics formula, factorization, ...)

(Credits from "l hodge" - @l_d_hodge on twitter)

It's easy to understand, it works with $a \neq 1$ and it has meaning.

It's based on change of variables and

Very concern about data privacy in public university course survey 

I participate in a course from a public university (UIB). I have to answer a survey from LimeSurvey.

I'm very concerned about my data privacy [] and that a public university uses external tool to make research surveys.

Don't they have enough money to make their own survey forms software? Can they guaranteed my privacy of my data (as any good survey must have)? I don't think so.

Falta de formació de qualitat 

Potser també es podria fer una formació a la UIB per als docents **de secundària**

Backup software advice 

I need a backup software in GNU/Linux. My requirements are:

- free software
- based on standard programs
- support for full and incremental backups
- User simply see the files (I don't need to uncompress or mount those as special file system)

So, for example, I drop borg from my list.

Any candidates?

In case you want to build your own server, I recommend you server

Mantained by Omar Polo

@Gargron Can you please accept protocol to support Link verification in web page? Thanks in advance

Si queréis os podéis apuntar al II Congreso de Adultos

Fecha: 11 y 12 de febrero de 2022. El formato es presencial y online

Anyone could create a home server like Daniel Clemente did some time ago [] (link in Spanish).

Why we don't do that and we rely on third-party actors (mostly enterprises)?

Ignorance? Danger Consequences like DDoS? or security breaches?

In my case, the only undesirable consequence of hosting my home server could be having no internet connection for other devices in my home if web server have a lot of demand (slashdot effect for example)

Per compleció, aquestes són algunes fotos de la manifestació i la convocatòria

El pròxim pas, dia 16 de desembre la comissió de medi ambient ha de pronunciar-se.

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Do you share materials with you collegues to teach better? Do you design new activities with other teachers in order to increase learning of students? Do you want?

Many teachers here are alone and just a few of that do those? Why? Is it intimidating for them? Is it cultural?

Why don't do that? Students would benefit from that. It's time to change what we do as a teachers. It's just my opinion. What's yours?

28 de novembre a les 11.00 davant decathlon per no permetre la creació d'un abocador d'escombraries a l'antiga Cantera d'Establiments (també anomenada pedrera Sa Garrigueta Rassa)

Mengeu molta fruita o no? Podríem fer una diària al nostres alumnes per saber-ho. En voxel n'ha fet una

Tendríem una excusa per treballar l' i de passada fer un poc d'hàbits saludables

Software for managing notes 

Good software: zk []

A command-line tool for write and manage notes using markdown files. It follows the philosophy.

It could be useful to have a web or GTK UI with the same features.

: using system to draw some figures:

Secondary education to adult people in CEPA Almazán, Castilla y León, Spain.

Anyone can help me to buy a computer? What features do you think are mandatory and recommended? AMD vs Intel CPU? Minimum RAM? The only requirement: it could be linux friendly.

So Nvidia GPU bannef

La conselleria d'educació de les Balears ha tret una convocatòria d'observació entre iguals. És una gran oportunitat: aprendreu de veure els altres, cream xarxa de docents, ens formen i a més ens donen crèdits de formació. Només cal una parella i fer 2 observacions a partir de gener. Vos podeu apuntar fins dia 30 de novembre.

Possible bug in Casio fx-570SP XII Iberia calculator 

I report this possible bug to Casio. They answered that if digits of numerator + digits of denominator > 10, then calculator returns decimal representation instead of simplified fraction.

Attached the page of the manual in which it specifies this.

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Be aware: there is no warrant of privacy in anything if we cannot access to source code. It includes duckduckgo and others search engines. Unlike Yacy which is open-source.

Possible bug in Casio fx-570SP XII Iberia calculator 

If you type 109328/40128 then the calculator does not return simplified fractions. It displays decimal number. With other numbers calculator displays simplified fraction

If parts per million of CO2 increases, is it implies that other gases decrease their ratio? How can I get historic data for example of 02?

Need mathematical comprehension of bitcoins 

I looking for a explaining what conditions need to satisfy a binary string to be a but I did not find it. Anyone could help me please @christianp Perhaps you could help me.

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