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Dengan hasil demikian,
(x-1)(x-2) adalah faktornya sehingga,
Anggap demikian,
Faktor persamaan:
(x-1)(x-2)(x-a) = 0
Dengan limit x⇒1
(x-2)(x-a) = -4
x²-(a+2)x+2a = -4
1²-(a+2)(1)+2a = -4
1-(a+2)+2a = -4
1-a-2+2a = -4
a-1 = -4
a = -3