I don’t get this question, please help.

Answer:
A = 7
B = 2
Step-by-step explanation:
The question is asking for the simplified form of √(-98). You are expected to know that √-1 = i, and you are expected to be able to factor the number 98.
[tex]\sqrt{-98}=\sqrt{(-1)(7^2)(2)}=7i\sqrt{2}[/tex]
Matching parts of the simplified expression to the form you are given, you see that ...
A = 7
B = 2