SOLUTION: how can I show my work for the problem x4+7x2=18

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: how can I show my work for the problem x4+7x2=18      Log On


   

Question 693942: how can I show my work for the problem x4+7x2=18
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
how can I show my work for the problem x4+7x2=18
--------
x^4 + 7x^2 - 18 = 0
------
(x^2+9)(x^2-2) = 0
----
x = +/-3i or x = +-isqrt(2)
================================
Cheers,
Stan H.