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(m + 1)x² - 2mx + m - 3 < 0 (Merupakan definit negatif)
Agar definit negatif
a < 0
m + 1 < 0
m < - 1 .......(1)
D < 0
(-2m)² - 4(m + 1)(m - 3) < 0
4m² - 4m² + 8m + 12 < 0
8m + 12 < 0
m < -3/2 ..........(2)
Persamaan (1) ∩ (2), diperoleh:
m < -3/2
Nilai m yang memenuhi adalah m < -3/2