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do you know how to divide them?

no :(

@nphuongsun93 and you help me?

woops sorry i'm here, 1 sec

first let me confirm is it (x^3 – 6x – 9x + 3) ÷ (x - 3) OR (x^3 – 6x^2 – 9x + 3) ÷ (x - 3)
^^^^^

(x^3 – 6x – 9x + 3) ÷ (x - 3) this is correct

then first simplify
x^3 - 6x - 9x + 3 = x^3 - 15x + 3|dw:1349205093592:dw|

|dw:1349205145845:dw|

|dw:1349205201562:dw|

|dw:1349205284237:dw|
(x^3 - 15x + 3) ÷ (x - 3) = x^2 + 3x - 6 remainder - 15

-15 or -51?

theses are my choices:
A: -51

B: -51
-------
x - 3

C:
-17
-------
x

D:
-17
--------
x - 3

@nphuongsun93 do you know?

On my paper its only 6x @nphuongsun93

I guess it was a misprint on there end. thanks @nphuongsun93