- #1
Monsterboy
- 303
- 96
Homework Statement
[itex] 144x^4 -40x^2 -639=0 [/itex]
Homework Equations
there are no clues about the roots ( in A.P,G.P or whatever)
The Attempt at a Solution
there are 2 real roots and 2 complex , i got the complex roots by solving it as a quadratic equation in x^2
[itex] 144((x^2)^2) -40x^2 -639=0 [/itex]
i don't know how to get the remaining real roots.