Which of the following polynomials is a trinomial?

3x3

4x - 1

x4 - 7x + 9

x3 + 2x2 - 5x + 3

The third option, since it has three terms:

x4

-7x

+9

Answer: x4 - 7x + 9

Step-by-step explanation:

Hi, a trinomial is a polynomial with three terms.

Analyzing the options given:

a-3x3 = 1 term

b-4x - 1 = 2 terms

c-x4 - 7x + 9 = 3 terms

d-x3 + 2x2 - 5x + 3 = 4 terms

The correct option is polynomial c.

Since option c has 3 terms, it is a trinomial.

Feel free to ask for more if needed or if you did not understand something.