nino86
Oct 30, 2011, 12:25 PM
what are the zeros of x^4-4x^2
Unknown008
Oct 31, 2011, 12:18 AM
Well, first of all, you can factorise x^2 like this:
x^4-4x^2 = x^2(x^2 - 4)
Then, can further factorise this using the difference of two squares.
From there, can you find the zeroes? :)