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= 6x - 60 - 2x kuadrat + 20x
= -2x kuadrat + 6x + 20x - 60
= -2x kuadrat + 26x - 60
(-2x+6)(x-10)
-2x^2+20x+6x-60
-2x^2+26×-60
supaya sederhana dibagi -2
×^2-13×+30