Latex problem with alignment character and &

[HMPARTICLE]

\begin{align*}
AB &= \sqrt{(2-(-1))^2+(3-4)^2}\\
&= \sqrt{3^2+(-1)^2}\\
&= \sqrt{10}.
\end{align*}

is what i am entering.
This is the error i am getting;

misplaced alignment character &.I am baffled.

 

[HMPARTICLE]

for some reason it is working on here, but not in my latex editor, i have tried 2 different latex editors :(

 

[mfb]

I guess it is a problem with the LaTeX editors, not a problem with the forum then.

 

[DrClaude]

for some reason it is working on here, but not in my latex editor, i have tried 2 different latex editors :(

The error might be due to the code appearing before this.

 

[alphy]

It appears that you are trying to use the align* environment in LaTeX to align equations using the "&" character. The error message you are receiving indicates that the "&" character is not being used correctly in the code.

In order for the align* environment to work properly, the "&" character must be placed before the alignment point in each line. In your code, the "&" character is not being used consistently, which is causing the error.

To fix this issue, make sure that the "&" character is placed before the "=" sign in each line. Your code should look like this:

\begin{align*}
AB &= \sqrt{(2-(-1))^2+(3-4)^2}\\
&= \sqrt{3^2+(-1)^2}\\
&= \sqrt{10}.
\end{align*}

This should resolve the alignment problem and allow your code to run without any errors. Keep in mind that alignment characters like "&" are important in LaTeX and must be used correctly in order for the code to work properly.