Question

I have to solver this:

x^3-3x^2-9x = 0
pls help!!

Answer 1

is there a common factor that can be pulled out?

Answer 2

they all have a x, so:

x(\[x^2-6x-9 = 0\]

Answer 3

good, so x=0 at least is one of the possibilities

Answer 4

and is that spose to be a -6x? or -3x

Answer 5

there are a few methods available to undo the quadratic part; which methods are you familiar with?

Answer 6

ow, -3x my bad

Answer 7

factoring, the quadratic formula

Answer 8

the quadratic formula is a sure bet then; we can use it to find the other x values that make this thing equal zero

Answer 9

then I have three different coordinates?

x = 0; x= 4.9 ; x = 1.9

Answer 10

as long as you did the quad formula correcly, then you should have at most 3 solutions since this is a 3degree poly to begin with

Answer 11

ow oke, thank you very much