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= (x+5)(x-3) : (x-3)
= x+5
| 1 2 -15
3 |
| 3 15
________+
1 5 0 ---> sisa
maka hasilnya yaitu x + 5
secara pembagian bersusun
x + 5
___________
x - 3 / x² + 2x - 15
x² - 3x
__________-
5x - 15
5x - 15
______-
0 ---> sisa
hasilnya yaitu x + 5