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pake cara : b - q / 2√a
= 4 +2 / 2 = 3 (D)
10) 1/x-3 - 6/(x-3)(x+3) = (x+3)-6 / (x-3)(x+3)
= (x-3)/ (x-3)(x+3)
= 1/(x+3) = 1/3+3 = 1/6 (C)