Write three binomials, each with a degree of 7.

Student: What is a "binomial"?
Me: A polynomial with two terms.
Student: Ohhhhhhhh I thought it was a made up word you put in the problem to trick us, because this is one of those impossible problems you can't solve.
Student #2: You idiot, it's just 3^7, duh.
Student: Wait, what's a "term"?

*sigh* Test tomorrow, not sure they're ready.