Final answer:
The expression (4x-2y + 3z) is already in its expanded form, as there are no brackets to distribute or terms to combine, so it remains unchanged.
Step-by-step explanation:
The expression given is (4x-2y + 3z).
To expand an expression in mathematics typically means to multiply out brackets or to express it as a sum of terms, but since there are no parentheses to distribute or terms to combine, the expression is already in its simplest expanded form.
So, the expanded expression remains (4x-2y + 3z).