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(2x + 3) (x-5) = 0
2x + 3 = 0 atau x-5 = 0
x = -3/2 x = 5
berarti akar-akarnya -3/2 dan 5
tinggal dikuadratkan.
2x² + 5x - 4 ≤ 3x² + 2
2x² + 5x - 4 - 3x² - 2 ≤ 0
- x² + 5x - 6 ≤ 0
pembuat nol
- x² + 5x - 6 = 0
(- x + 3) ( x - 2) = 0
- x - 3 = 0 atau x -2 = 0
- x = -3 x = 2
x = 3
buat garis bilangan dan cari yang bernilai negatif