Question

Sum of radical sign -2 and radical sign -18

Answer 1

B

Explanation:

Note that
`√(-1)` = i

`√(-2)` =
`√(2(-1))` =
`√(2)` i

`√(-18)` =
`√(9(2)(-1))` = 3
`√(2)` i

Thus the sum is

`√(2)` i + 3
`√(2)` i = 4
`√(2)` i → B