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kalau 9x²-81 = 0
9x² = 81
x² = 81 / 9
x² = 9
x = plus minus 9
x = 9 dan x = -9
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kalau 9x²-82 = 0
9x² = 82
x² = 82/9
x = plus minus √82/9
x = plus minus √82 / 3
x = √82 / 3 dan x = -√82 / 3