Which algebraic expression is a polynomial with a degree of 2?

I do not see an attachment, but it is really quite simple. All you need to do is find the polynomial where its highest exponent would be 2. For example:

x³+x²+6x-9 would be wrong because the highest exponent is three.

However, x²+8x-6 is correct because the highest exponent is 2. Very simple.