Yes, because there is no equal sign. Having an equal sign would make it an equation.
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ab increased by 2
A polynomial is always going to be an algebraic expression, but an algebraic expression doesn't always have to be a polynomial. An algebraic expression is an expression with a variable in it, and a polynomial is an expression with multiple terms with variables in it.
It is an algebraic expression
They are two terms of an algebraic expression.
ab + 2