Isn't that a lot easier to read than "2x5 − 5x4 + ax". It takes so little effort to learn to do the LaTeX code.
Click on the “go advanced” tab. On the toolbar you will see clicking on that give the LaTeX wraps, [tex] [/tex]. The code goes between them.
You will find that helpers are more likely to reply to well formatted questions.
Now did i read your question correctly?