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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}
3) 2x² + 3x - 4 = 0
x₁ + x₂ = -b/a = -3/2
6) 2π rad = 360° maka π rad = 180°
1/5 π rad = 1/5 x 180 = 36°
360° = 1 putaran
36° = 1/10 putaran
7) 1/6 putaran = 1/6 x 360 = 60°
60° = 1/3 π rad
8) komplemen dr 15° = 90° - 15° = 75°
semoga membantu ya :)