Sequences and Series Formulas

 

 

 

www.cuemath.com/sequences-and-series-formulas/

Teorema Vieta

 

Aljabar Palinomial

 

Pangkat 2

 

Rumus akar

rumus deskriminan

Diskriminan ini membantu kita mengetahui apakah akar-akar persamaan tersebut real dan berbeda, real dan sama, atau imajiner

D>0 -> Persamaan kuadrat memiliki dua akar real yang berbeda

D=0 Persamaan kuadrat memiliki dua akar real yang sama (akar kembar)

D<0 Persamaan kuadrat memiliki dua akar imajiner

 

Jumlah akar (r1 + r2): -b/a

Hasil kali akar (r1 * r2): c/a

 

Pangkat 3

 

Bila r1, r2, dan r3 adalah akar dari  maaka

Note: gunakan Cardan (Cardano) RUMIT

 

Jumlah akar (r1 + r2 + r3): -b/a

Jumlah hasil kali akar dua-dua (r1r2 + r1r3 + r2r3): c/a

Hasil kali akar (r1 * r2 * r3): -d/a

 

Pangkat 4

 

Note: akar/factor dihitung dengan metode Ferrari, dan metode Ruffini RUMIT

 

Teorema Vieta

 

 

Debian 12: Installing KVM (Virtualization) (part 1)

Install kvm. as a root/sudo run 

# apt install qemu-system libvirt-daemon-system
...
0 upgraded, 83 newly installed, 0 to remove and 0 not upgraded.
Need to get 143 MB/143 MB of archives.
After this operation, 971 MB of additional disk space will be used.
Do you want to continue? [Y/n]


for server or you do not need any graphical packages

# apt install --no-install-recommends qemu-system libvirt-clients libvirt-daemon-system

You need to add user into libvirt group to let the user manage your guest virtual machine

# adduser [username] libvirt
Adding user `[username]' to group `libvirt' ...
Done.


if you prefer to use graphical, install virt-manager

# apt-get install virt-manager
...
0 upgraded, 28 newly installed, 0 to remove and 0 not upgraded.Need to get 4,780 kB of archives.
After this operation, 21.3 MB of additional disk space will be used.
Do you want to continue? [Y/n] y


You can exit root mode and use the user above to manage your guest virtual machine.

Facebook custom "friend list"

Facebook has feature to create and maintain custom "friend list". The purpose of 'friend list" is to share with spesific list of friends.

For example, you have friend lists contain

1. list of college 

2. list of family

3. list of gamer

4. list of office friends

5. etc

By default, when you add a new friend or accepting a new friend, he/she will be member of "Friend" list. You can not remove a member from "Friend" list.

A friend can be member from some list. For example Mr Foo can member of gamer and college.

When we post something, there are 5 targeted audience:

1. public : to view worldwide

2. friends : only facebooker that is your friend.

3. friends except... : only facebooker that is your friend without some friends that you excluded.

4. only me : only you (to keep personal)

5. see more : where you can pick custom list. Only one list you can select.

To create custom "friend list" (on PC)

1. sign in using pc 

2. from your feed, Friend -> see more.

3. Custom list -> create list

4. fill the name of list and confirm.

5. you can start to fill the custom list.

How to put/remove a friend in custom list on android

1. search your friend and open his/her profile.

2. tap "Friends" -> "Edit friend list

3. select/check friend list to add friend. you select/check more then one. for example, you check game and college. or you can remove a friend from list friend vy unselect/uncheck it.

4. click back button to save it.

when you need, to post something for specifif friend, change audience from public/friends to see more, then select list friend you prefered.

tips:

it is hard to maintain friend list if member so big, ie more then 100. we suggest:

1. create friend list only for spesific purpose that required privacy. for example family, office, college, etc.

2. when you add/accept your spesific friend,  immediately put he/she into your list friend.

How to search and fix broken link in your blogspot

Blogspot indexing stopped when your pages have broken link

You can use external online tool to find out where is broken link. 

There are 2 online tool available for free

1. 1. https://www.deadlinkchecker.com/ -> faster
2. 2. https://www.brokenlinkcheck.com -> slower

put your root url e.q. https://dedetoknotes.blogspot.com.

Put your root url e.q. https://dedetoknotes.blogspot.com, and click search. Fill captcha code is required. 

After waiting for some times, the web will show you which link are broken. 

In other browser, sign in into your blogspot. Find a key workd which the link was broken.

For example link reported broken was https://github.com/dedetok/fail2ban-to-mysql/blob/gh-pages/mlocaldb.conf. You can find in blogspot search "fail2ban to mysql".

Repeat to search and fix manually the broken link. You can ask the web tool to researching broken link.

NOTE:

Do not put any active url link into your page! Just inform the url, not linked it.