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X2+9x-3x-27
X(x+9) -3(x+9)
(X-3) (x+9)
x = 3 dan x = -9
Pertama itu -27 = berapa kali berapa yg nanti kalau dijumlah hasilnya + 6 kan berarti -3 dan 9
x2 - 3x + 9x - 27
x (x - 3) + 9(x - 3)
x + 9 dan x - 3
x = -9 dan x= 3