Question

Write the given expression in terms of i : √-245

a) -245 i

b) -7 i √5

c) i √-245

d) 7 i √5

Answer 1

Okay, so first things first:
i =
`√(-1)`
That said, no answer that has -245 is correct.

Now we just need to solve
`√(245)`
245/5=5*49

`√(5) * √(49) = 7i*√(5)`
So, that's your answer, option D.