Question

Which of the following is the fourth term in the expansion of (3 - x)5?

-81x^4
-90x^3
81x^4
90x^3

Answer 1

fourth term in (3-x)^5

Answer 2

fourth term in that order would be an x^3, so you can eliminate two of the choices.

Answer 3

hmm... then I say it's -90x^3

Answer 4

@tutordiffeq what do you say

Answer 5

@aroub how did u get that