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D= b²-4ac
4²-4(m-1)(2m) ≥ 0
16-(4m-4) 2m ≥ 0
16-8m²+8m ≥ 0
-m²+m+2 ≥ 0
m²-m-2 ≤ 0 ..pertdks (A)
buat batasan m
(m-2) (m+1) = 0
m= 2 dan m = -1
_______-1______2_____
'0' berada diantara -1 dan 2, uji bilangan '0' ke pertidaksamaan (A)
0²-0-2 = -2 (negatif)
++++-1 ----- 2 ++++
tand pertidaksamaan ≤ 0 (negatif)
-1 ≤ m ≤ 2