Xto 4th power -3X to 3rd power - 40x squared = 0 How do I set this up into a quadratic equation? There are no examples close to this in my book. Do I sub. U forX to 3rd? If can have the set up or a formula for working this I can get it.

buddy wrote:Xto 4th power -3X to 3rd power - 40x squared = 0 How do I set this up into a quadratic equation? There are no examples close to this in my book. Do I sub. U forX to 3rd? If can have the set up or a formula for working this I can get it.

I take it that the equation given is The first thing you should do is see if you can find any common factors in the terms on the left-hand side. What can you factor out of

Once you have the left side factored completely, set each factor equal to zero (separately) and solve for Since this is a fourth-degree polynomial, you will have at most four solutions.

Good luck!

do i do x2 out f everything? then wat?

- stapel_eliz
**Posts:**1733**Joined:**Mon Dec 08, 2008 4:22 pm-
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Yes, **factor** the x^{2} out.

Then**factor the remaining quadratic**.

. . . . .

Hint: What factors of 40 are three units apart?

Then

. . . . .

Hint: What factors of 40 are three units apart?

got it thnx anyway