How do you solve a quartic equation by hand?

Question

hero · Answer

substitution

hero · Answer

a^4 = x^2

hero · Answer

If it's a trinomial, that works perfectly

hero · Answer

Then you could just use quadratic equation or maybe it will be factorable....Depends...

hero · Answer

There's other methods too. Sometimes , substitution doesn't give you the right form when you find x.

anonymous · Answer

hmmm...well, for example...$$x^4-15x^2-6x+(73-r^2)$$ where r is a constant

hero · Answer

I've seen this before. It's like the whole $$x^4-15x^2-6x $$ becomes c value

hero · Answer

So you're supposed to use quadratic formula

hero · Answer

I wish I'd saved this in geogebra.

anonymous · Answer

lol I'm pretty confused :/

hero · Answer

If I were you, I'd be confused too

hero · Answer

Hold on, looks like I was smart enough to save the previous one afterall...

hero · Answer

Yeah, you have to use quadratic formula. I don't recommend trying to solve this by any other means....

hero · Answer

It doesn't tell  you what to solve for, does it?

hero · Answer

Would help to post the full set of instructions