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Sehingga,
Dengan:
a = M
b = -2
c = 5
Didapat:
D ≥ 0
b² - 4ac ≥ 0
(-2)² - 4.M.5 ≥ 0
4 - 20M ≥ 0
-20M ≥ -4
Dengan dibagi dengan -4, tanda ditukar:
5M ≤ 1
M ≤ 1/5