Question

Find all the roots of 2y^4 - 9y^3 + 14y^2 + 6y - 63 = 0

Answer 1

Can someone tell me how to start?

Answer 2

Use the rational roots theorem (assuming you have to do this by hand)

Answer 3

I do... no calculator :c Thank you!

Answer 4

So you know how, right?

Answer 5

No... I'm looking it up right now. All I needed to know was how to start (for now at least). :)

Answer 6

If you're still there, is it also called Rational Zero Theorem?

Answer 7

Just making sure I'm doing the right thing

Answer 8

Quick summary:

If you have some poly ax^n+..........+ c then rational roots theorem says possible roots are

plus/minus factor combos of c/a so in this case 63/2 = 3*3*7/2*1 ->

3/1.-3/1, 3/2,-3/2, etc.....

(full details here http://en.wikipedia.org/wiki/Rational_root_theorem)

Answer 9

Okay, thank you!

Answer 10

ur welcome