Posted by **Rosa** on Wednesday, January 25, 2012 at 10:24pm.

9x^-4-35x^-2-4=0

- College Algebra -
**Reiny**, Wednesday, January 25, 2012 at 10:46pm
I assume we are solving?

multiply each term by x^4

9 - 35x^2 - 4x^4 = 0

4x^4 + 35x^2 - 9 = 0

(x^2 +9)(4x^2 - 1) = 0

x^2 = -9 or x^2 = 1/4

x = ± 3i or x = ± 1/2

- College Algebra -
**Damon**, Wednesday, January 25, 2012 at 10:48pm
let z = x^-2

then z^2 = x^-4

9 z^2 - 35 z - 4 = 0

(9z+1)(z-4) = 0

z = 4 or z = -1/9

you take it from there

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