No. The question contains three negative numbers. There is nothing to justify!
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To justify something in math is to prove it. Example: Justify 4x = 8 when x = 2. When x = 2, 4(2) = 8. Done. By doing this I justified that 4x = 8 when x = 2.
It isn't clear what you want to justify.
It means give logical reasons for whatever you are trying to justify.
No. Sqrt(-4) contains a radical but it not irrational; it is imaginary.
1/4 + 1/4 + 1/4 + 1/4 = 4/4 = 1/1 = 1