Question

The roots of the equation k^4 - 7k^2 - 8=0 are?

Answer 1

k^4 - 7k^2 - 8=0
(k^2)^2 -8k^2 + k^2 -8 = 0
k^2 (k^2 -8) + (k^2 -8) = 0
(k^2 +1) ( k^2 -8) = 0
k^2 +1 = 0 or k^2 -8 = 0
Now solve these two equations.

Answer 2

thxxx for helping i got it

Answer 3

welcome!