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misal x1 = A & x2=B
2x²+x+6 ≡ (x-A) (x-B)
2x²+x+6 ≡ x² - bx - ax +ab
2x²+x+6 ≡ x² - (a-b)x + ab
⇒ 2x²≡x² ⇒ x ≡ (a-b)x ⇒ 6 ≡ ab
x=2 ? ?
tinggal a= ..... dan b= ......
kamu nyari sendiri yah ;) tinggal ngisi tanda tanya nya doang