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syarat mempunyai akar real, D ≥ 0
b² - 4ac ≥ 0
4² - 4 (m - 1) . 2m ≥ 0
16 - 8m² + 8m ≥ 0
2 - m² + m ≥ 0
-m² + m + 2 ≥ 0
(-m - 1) (m - 2) ≥ 0
m = -1 atau m = 2
selesaikan dgn garis bilangan:
- - - - + + + + - - - -
-1 2
krn tanda ≥ maka penyelesaian yg +
{m | -1 ≤ m ≤ 2}
semoga membantu ya :)