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50 = (x+3) . (x-2)
50 = x²-2x+3x-6
50 = x²+x-6
0 = x²+x-6-50
0 = x²+x-56
(x+8) (x-7) = 0
(x-7) = 0/(x+8)
x- 7 = 0
x = 0+7
x = 7
x1=7 x2=-8
jadi,.jawaban yang mungkin adalah a dan d