# Math Help - roots

1. ## roots

What are the root of $x^4-8x^2-8x-2?$ I want precise not with decimals.

2. Originally Posted by peteryellow

What are the root of $x^4-8x^2-8x-2?$ I want precise not with decimals.
$x^4-8x^2-8x-2=x^4-2(2x+1)^2=(x^2-2\sqrt{2}x - \sqrt{2})(x^2+2\sqrt{2}x + \sqrt{2}).$

3. And you can use the quadratic formula to find zeros of those two quadratic factors.

4. You'll be lucky becuase I get:

3.2620
-2.1796
-0.6488
-0.4335

as your roots

Oops I take that back...........(didnt read the already posted replies duhhh)