how do you solve solve x^4+5x^2-6=0

Question

austinl · Answer

$ x^4+5x^2-6=0$
I would factor this one out.

anonymous · Answer

plug  x^2=t and solve for t and finally x

debbieg · Answer

Just remember that $\Large x^4=(x^2)^2$

You could make an explicit substitution like $\Large u=x^2$ to solve for u, then find x from that. But really you can probably do it without the substituion as the factoring is pretty straight-forward.

anonymous · Answer

The attached plot may help.

goformit100 · Answer

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