Question

how do i factor x^3 -3x -2 = 0?
which method do i use?

Answer 1

are you allowed to use calculator for test?

Answer 2

its not a test..i can use anything but i'd rather do it by hand...i need to know how to work it..

Answer 3

i just need the next step..just a hint please

Answer 4

you need to find a zero of the polynomial
f(x)=x^3 -3x -2

The fastest way is to use trial an error
Try x=2,
f(2)=2^3-3(2)-2
f(2)=0
Then, (x-2) is a factor of f(x)

Then do long division (look at the attachment)
you'll get x^2+2x+1

(x^2+2x+1)(x-2)

Factor x^2+2x+1
(x+1)^2(x-2)

Answer 5

that 0 that's taking the x^2 spot..is that supposed to be a one?

Answer 6

^ doubt it when factoring normally you set it to zero...

Answer 7

get a, b, c terms on one side to get ready to factor. it leaves the right side a 0 if done right.

Answer 8

actually wait what? restate your question?

Answer 9

i've got it now..thank you guys..

Answer 10

Great!