Question

8i

−8

8i2

−8i
NO LINKS

Answer 1

Explanation:

x² = -64

= -1 · 64

Using -1 = i²:

x² = 64 · i²

Using 64 = 8²:

x² = 8² · i²

= (8·i)²

Taking the square root of both sides:

x = 8i