Which expression is a trinomial?

a. 3x^2y^2x^2
b. x^2+y^2+z^2
c. x^2+y+1/2
d. x+z^2

My answer: B

B and C are both trinomials. Typo?

What were you doing up that early?

To determine which expression is a trinomial, we need to understand what a trinomial is. A trinomial is a polynomial with three terms.

Let's analyze each expression to see if it fits the criteria:

a. 3x^2y^2x^2 - This expression is not a trinomial because it has multiple variables and their exponents combined, but only one term.

b. x^2 + y^2 + z^2 - This expression is a trinomial since it has three terms: x^2, y^2, and z^2.

c. x^2 + y + 1/2 - This expression is not a trinomial because it has a constant term (1/2), which is unrelated to the variables.

d. x + z^2 - This expression is not a trinomial because it has two terms: x and z^2.

Therefore, the correct answer is b. x^2 + y^2 + z^2.