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alas = x
tinggi = x-5
½ alas × tinggi = Luas
½ x (x-5) = 150
x(x-5)=2×150
x²-5x=300
x²-5x-300=0 ----> persamaan kuadrat
Jika cari x nya tinggal sambung
(x-20)(x+15)=0
x=20
Jadi alas = 20 cm dan tinggi = 15 cm