The polynomial expression that has a leading coefficient of 3 and a constant term of -4 is: -4x² + 3x^4 - 4.
A leading coeeficient in a polynomial expression is the coefficient of the term that has the highest degree.
The leading coeeficient of -4x² + 3x^4 - 4 is 3.
The constant is -4.
Therefore, the polynomial expression is: -4x² + 3x^4 - 4.
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