What is the name of this polynomial 12x^3-4x^5-2x

12x^3 - 4x^5 - 2x

u have 3 terms ... (12x^3) and (-4x^5) and (-2x) ... making this a trinomial

the degree of this trinomial, being as it only has 1 variable, is the highest exponent ... and that would be ^5

so this is a 5th degree trinomial