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1 -2 -13 +20
↓_4__8__20_______:x=4
1 2 5 0
jadi x2 + 2x + 5
x² + 2x - 5
x - 4 / x³ - 2x² - 13x + 20
x³ - 4x²₋
2x²- 13x
2x² - 8x ₋
- 5x + 20
- 5x + 20
0