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_x²+x-12____________ ---> hasil bagi
x²-3x+3 / x⁴-2x³-12x²+39x-36
x⁴-3x³+3x²
----------------------------- - -
x³-15x²+39x
x³- 3x²+3x
------------------------ -
-12x²+36x-36
-12x²+36x-36
--------------------- -
0
sehingga hasil bagi = x² + x - 12
atau cara horner
1 -2 -12 39 -36
3 3 3 -27 36
------------------------------------------- +
1 1 -9 12 0
-4 -4 12 -12
------------------------------------ +
1 -3 3 0
x² -3x 3 ----> faktor : x²-3x+3
dan (x-3) (x+4) = x²+x-12 --> faktor