answer:
4 square root of 2 i (i it's outside the square root)
explanation:
square root of -2 = square root of 2 i (i being outside)
and square root of -18 = square root of 1 and square root of 9*2, square root of 1 = i, and the square root of 9 is 3, leaving square 2 alone
so it would look like:
square root of 2 i PLUS 3 square root of 2 i (i being outside as well)
there is a 1 outside the square root of 2 i, that 1 adds up with the 3 and since the square roots are the same, they stay the same
so 4 square root of 2 i
