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[√x + 1/√x]² = 3²
x + 2(√x)(1/√x) + (1/√x)² = 9
x + 2 + 1/x = 9 ⇒ x + 1/x = 7.... [persamaan-1]
Jawaban soal a). x + 1/x = 7
Kuadratkan persamaan-1
[x + 1/x = 7]²
x² + 2 + 1/x² = 49
Jawaban soal b. x² + 1/x² = 47
Maaf, soal c belum ada ide