**Question:**

Find all values of z such that z^4 - 4z^2 +3 = 0.

**What I did:**

z^2 = y

y^2 - 4y + 3 = 0

(y - 3)(y - 1) = 0

y = 3 ... y2 = 3 ... **y = rt 3**

y = 1 ... y^2 = 1 ... **y = 1**

Why is my answer wrong?

Guest Aug 31, 2020

edited by
Guest
Aug 31, 2020