Question

Classify 3x^5 - 8x^3 - 2x^2 + 5 by number of terms.

Answer 1

how many terms can you count/

Answer 2

iff the is exactly one term its a monomial
iff the is exactly two terms its a binomial
iff the is exactly three terms its a trinomial
iff there is exactly four terms its a quadrinomial
iff there is exactly five terms its a quintinomial
...

Answer 3

Okay, so there are four terms here:
3x^5
8x^3
2x^2
5

So, its a quadrinomial.

Thanks to Rakhus too xD

Answer 4

Normally when more than 3 terms they would call it polynomial, but quadrinomial works too.