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syarat : b² - 4ac ≥ 0
16 - 4.2(m - 1) ≥ 0
16 - 8m + 8 ≥ 0
24 - 8m ≥ 0
-8m ≥ -24 ruas kiri n kanan dikali -1 (jangan lupa tanda "≥" dibali jadi "≤")
m ≤ -24/-8
m ≤ 3