what is the sum of the square root of -2 and the square root of -18?
sqrt (-2) + sqrt (-18) =
i * sqrt (2) + i * sqrt (9 * 2) =
i * sqrt (2) + i * sqrt (9) * sqrt (2) =
i * sqrt (2) + i * 3 *sqrt (2) =
i * sqrt (2) + 3i * sqrt (2) =
4i * sqrt (2) =
4sqrt (2) i
