- #1

- 127

- 0

Hello,

Factor: 4x[itex]^{4}[/itex]-x[itex]^{2}[/itex]-18

I solved a similar problem x[itex]^{4}[/itex]-6x[itex]^{2}[/itex]+9 by equating x[itex]^{2}[/itex] to t and then reverse-FOIL'ing... this one just wouldn't give in...

Completing the square also does not help to get the answer (presuming of course that the answer is correct, which I wouldn't dare not to do before consulting in this forum)...

I have the answear: (x^2+2)(2x-3)(2x+3), so I need your help on the reasoning process guys.

## Homework Statement

Factor: 4x[itex]^{4}[/itex]-x[itex]^{2}[/itex]-18

## The Attempt at a Solution

I solved a similar problem x[itex]^{4}[/itex]-6x[itex]^{2}[/itex]+9 by equating x[itex]^{2}[/itex] to t and then reverse-FOIL'ing... this one just wouldn't give in...

Completing the square also does not help to get the answer (presuming of course that the answer is correct, which I wouldn't dare not to do before consulting in this forum)...

I have the answear: (x^2+2)(2x-3)(2x+3), so I need your help on the reasoning process guys.

Last edited: