Question

Can anyone show me how to work these out?

Solve each equation in the complex number system.
X^4=1

X^4+3x^2-4=0

Answer 1

i can get you started :
1.
x^4 = 1

(x^2)^2 -1^2 = 0

(x^2+1)(x^2-1) =0
....

2. x^4+3x^2 -4=0
Let x^2 = a
a^2 +3a-4 = 0
find 2 values of a first.

Lets see how much you can work each of them out. Go!

Answer 2

Thank you so much that actually helped. I always have trouble getting to that point.

Answer 3

welcome ^_^