Welcome to MHF! Hope you find this forum a helpful resource. If you are satisified with any of the help you receive here, show your gratitude by clicking the 'Thanks' button beneath a post or simply leaving a thank you!

To produce these math symbols, take a look at this tutorial: LaTex Tutorial

Basically, wrapping coding around [tex][/tex] will produce these images. For example, is produced by [tex]x^{2} \equiv 2 \; (\text{mod } 4)[/tex]. If you want to see the coding behind an image, just click on it!

_________________________

As for your question: for some

Since , we can divide both sides by :

Now use the fact that if and , then .

Can you finish?