Final answer:
The polynomial is written in standard form as 12x^3 - 4x^5 + 3 - 15x, with the leading term being -4x^5, leading coefficient -4, degree 5, and constant term 3.
Step-by-step explanation:
The given polynomial can be rewritten in standard form as:
12x^3 - 4x^5 + 3 - 15x
The leading term of the polynomial is -4x^5.
The leading coefficient is -4.
The degree of the polynomial is 5.
The constant term is 3.