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x(x**-4x+20) -5(x**-4x+20)
x***-4x**+20x-5x**+20x-100
x***-9x**+40x-100
ket : x*** = pangkat 3
x** = pangakt 2
=x-5 . x²-4x+20
=x-4x-5+20.x²
=-3x+15.x²
Ket.
Titik Itu adalah kali