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## Homework Statement

Compute the 4th roots of -16 in both Cartesian and polar form and plot their positions in the complex plane.

## Homework Equations

z^1/n=(r^1/n)(e^i(theta)/n), (r^1/n)(e^i(theta)/n)(e^i2(pi)/n........

## The Attempt at a Solution

How do I find the value of r, and theta??