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panjang = 3 cm lebihh daru lebar = x + 3
Luasnya paling sedikit 15 cm² maka ≥ 15
Jadi petidaksamaannya
panjang x lebar ≥ luas
(x +3) x ≥ 15
x² + 3x - 15 ≥ 0
Semoga bermanfaat .. :)