How can I type this?

I want to type a question about matrixes and determinants. How can I type this?

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Math	Appears as
Remember to wrap math in `$` ... `$` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
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Comments

If you keep the code "\begin{pmatrix} a & b \ _ \ c & d \end{pmatrix}" in Latex brackets ("_" only shows that you should not give any gap as I have shown in the code) it will appear as $\begin{pmatrix} a & b \\ c & d \end{pmatrix}$ . If you replace "pmatrix" by "vmatrix" you will get $\begin{vmatrix} a & b \\ c & d \end{vmatrix}$ . If you want more clarity move your cursor on the matrices or determinants given below :

$\begin{pmatrix} a & b & x\\ c & d & y \end{pmatrix}$ and $\begin{vmatrix} a & b & x\\ c & d & y \end{vmatrix}$

$\begin{pmatrix} a & b & 1 \\ x & y & 2 \\ c & d & 3\end{pmatrix}$ and $\begin{vmatrix} a & b & 1 \\ x & y & 2 \\ c & d & 3\end{vmatrix}$

Ram Mohith - 2 years, 4 months ago

Go to the wiki matrices. Move the cursor on any matrix. Then the latex code will appear which may guide you to write matrices and determinants.

Ram Mohith - 2 years, 4 months ago

You go to the community page (next to "courses" when you're using the desktop version; or in the menu at the top right in the mobile version) and then click start contributing.
This will bring you to an editor. The type "problem" is already selected (for a wiki or discussion you would click on them). Then, you enter the title and text of the problem, and its answer either as a numerical value (you can use integers, decimal numbers and scientific notation) or by multiple choice (the answer choices will get mixed every time someone tries the problem).
Lastly, but optionally, you can select a topic out of the standard math and science topics (probably "algebra" for matrices, but depending on the type of problem it could so be something different).

Then, you click "post", and the program will check if you entered all required fields. Next to "post", there is a button "guidelines" that shows a short explanation for all fields.

Henry U - 2 years, 4 months ago

And don't worry, it's not as complicated as the length of my comment might suggest.

Henry U - 2 years, 4 months ago

Thank you! Here is my problem

Culver Kwan - 2 years, 4 months ago

That I have post.

Culver Kwan - 2 years, 4 months ago

Math	Appears as
Remember to wrap math in `\(` ... `\)` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$