Matrix Math Problems: [1 2 3; 2 3 4; 3 4 5] ||[3 4; 3 4]

[dangish]

$$\left[1 2 3<br /> 2 3 4<br /> 3 4 5\right]$$
$$\left3 4<br /> 3 4\right\|\|$$

 

[gb7nash]

The answer is 42.

 

[dangish]

I can't figure out how to post matricies lol

 

[dangish]

$$\left[2 1 2\right]$$
$$\left[1 2 3\right]$$

 

[eumyang]

Use the bmatrix command, like this:

$$\begin{bmatrix}<br /> 2& 1& 2 \\<br /> 1& 2& 3<br /> \end{bmatrix}$$

(Click on the matrix and you can see the code I used.)

 

[Mark44]

[ tex]\begin{bmatrix} 2 & 1 & 2 \\ 1 & 2 & 3 \end{bmatrix} [ /tex]

Just remove the leading spaces in the tex and /tex tags.