A trinomial is a polynomial that has three terms. The terms of any expression are separated by the +/- symbols and the constants are the terms that have no variables, i.e. the numbers that are alone.
A.
Has three terms
"x"
"4y"
"7" → is a constant
B.
Has two terms
"-x"
"y10"
C.
Has only one term
D.
Has three terms
"x³"
"11x²"
"x"
The only expression that is a trinomial with a constant term is A.