Write the given expression in terms of i : √-245 a) -245 i b) -7 i √5 c) i √-245 d) 7 i √5

Okay, so first things first:
i = 
That said, no answer that has -245 is correct.

Now we just need to solve 
245/5=5*49

So, that's your answer, option D.

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