Question

solve in interval notation:

x^4-4x^2>0

Help please!!!

Answer 1

\[x^{2}(x ^{2}-4). \]
And then do a sign chart to find that
the answer is: \[(-\infty,2) and (2,\infty)\]

Answer 2

do you mean -\[(-\infty,-2) U (2,\infty)\] cause when I tested the middle I got that it was a no

Answer 3

x^2- 4 is the plus and minus or is that x^2+4 ?