Answer:
10 terms
Explanation:
For (ax + b)ⁿ, there will be (n + 1) terms;
Easy way to remember this is to think of the basic example (x + 1)¹, which has a binomial to the power 1, and 2 terms;
Similarly, the example of (x + 1)² has the binomial to the power 2 and 3 terms.
