-68

Rewrite -68 as -1(68).

-1(68)

Rewrite -1(68) as -1⋅68.

-1⋅68

Rewrite -1 as i.

i⋅68

Factor 4 out of 68.

i⋅4(17)

Rewrite 4 as 22.

i⋅22⋅17

i⋅22⋅17

Pull terms out from under the radical.

i⋅(217)

Move 2 to the left of i.

2i17

Evaluate square root of -68