you can use "^" to represent powers. typing 2x^2 means 2x squared. also, you can learn to use LaTex, it's not that hard, so you can write

i attached a pdf to the end of this post, it is the LaTex tutorial that you can find on this site

by the way, you are correct, you would multiply the price function by x to get the revenue function (but dont call it p, call it something else, like r, you already have the function p defined as something else, naming the new function using the same variable causes confusion). why do you think that is how we get the desired function?