what is an example of a quartic trinomial with a negative leading coefficient and an even constant?

Here's an example. The first coefficient is negative, there are only three terms, the trinomial is at its fourth degree, and the constant is even.
 

\(-3x^4+6x^2+106\)

what is an example of a quartic trinomial with a negative leading coefficient and an even constant?

quartic - I looked this up and the different definitions are confusing but most articals seem to imply that is it just a polynomial of degreee 4.    i.e. the highest power is 4.

Trinomial - 3 terms

negative leading coefficient 

even constant - the constant is the number that is not attached to a pronumeral

\(-x^4+5x+8\)

three terms therefore a trinomial

degree 4

8 is an even constant

-1 is a negative leading co-efficient