Of course there's a constant term. It's understood. Quadratic trinomials are all of the formYour trinomial is equivalent to Where the leading coefficient (the coefficient of x2) is understood to be a = 1. The coefficient of x is b= 4/9 and the constant term is understood to be c=0. So the answer to your question is: The constant term is understood to be 0. Sorry the other tutor didn't know what you were asking. Edwin