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Kelas : X
2n² - 4n = 192 → 2n² - 4n - 192 :/2
= n² - 2n - 96 = 0
→ Gunakan rumus abc pada n² - 2n - 96, didapa nilai x1 dan x2, yaitu :
x1.x2 = -(b) ± √b² - 4ac / 2a
= -(-2) ± √(-2)² - 4(1)(-96) / 2(1)
= 2 ± √4 + 384 / 2
= 2 ± √388 / 2
= 2 ± 2√97 / 2
= 1 ± √97
Sehingga di dapt nilai x1 dan x2, yaitu :
x1 = 1 - √97
x2 = 1 + √97
Semoga membantu...