How is this task solved?

Question

C++ / C#

Good day friends. They gave me the task to create an expression function:

I know the basics of C++. But I did not understand this task at all! Can you at least explain what needs to be done? what do they want from me?))
I hope for your help!

Answer 1

x takes values ​​from 0.3 to 2.9 with step h = 0.3. y = first line if x<√a, or second line if x>= √a