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Kelas X
Bab Persamaan Kuadrat
X²-10x+21=0
Tentukan akar-akar persamaan kuadrat dengan melengkapkan kuadrat sempurna
x² - 10x + 21 + 4 = 4
x² - 10x + 25 = 4
(x - 5)² = 4
x - 5 = + / - √4
x - 5 = 2
x = 7
x - 5 = -2
x = 3
Jadi .. Hp = {xΙx = 3 atau x = 7 }