Question

factor x^4-1

Answer 1

(x-1)(x+1)(x^2+1)
x = 1
x = -1
x = i
x = -i

Answer 2

could you then factor the x^2+1 to (x-1)(x+1) so that fully factored would be (x-1)(x+1)(x-1)(x+1)?

Answer 3

(x^2 +1) Factored is actually

(x - i)(x + i)

Answer 4

where does the i come from?

Answer 5

x^2+1 is the sum of two squares and will not factor within the set of real numbers.

Answer 6

gotcha thank you.

Answer 7

yw