We want to simplify √(-48).
Note that
i² = -1 by definition.
Therefore
Answer: c.
5. D (the number under the square root symbol must be greater than or equal to 0.
Answer:
Move left 7 units: (-4 - 7, 2) --> (-11, 2)
Then move right 9 units: (-11 + 9, 2) --> (-2,2)