Which of the following is a trinomial? c2 + c + 6 c2 - 16 - 8c c3 + 4c2 - 12c + 7

Trinomial is defined as a polynomial with three terms separated by a operation (+,-).

c² + c + 6 AND c² - 16 - 8c are trinomials.

c² + c + 6

1st term: c²

2nd term: c

3rd term: 6

c² - 16 - 8c

1st term: c²

2nd term: 16

3rd term: 8c

When there is only one term it is identified as monomial; two terms is identified as binomial; polynomial means many terms.