I write in LaTex frequently,so I don't understand what is going wrong. I'm getting compile errors. The first line works, the second errors out. Can anybody see what is going on? (note: I'm inserting a 0 in the math command so that it doesn't compile in this post)

[m0ath]y=2x^2-8x[/tex]

[m0ath]2x^2-8x-y=0[/tex]