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Bab Eksponensial
Matematika SMA Kelas X

x^(1/2 ) + x^(-1/2) = 2
(x^(1/2) + x^(-1/2))² = 2²
x^(1/2)² + x^(-1/2)²  + 2 . x^(1/2) . x^(-1/2) = 4
x^1 + x^(-1) + 2 . x^(1/2 - 1/2) = 4
x + 1/x + 2 = 4
x + 1/x = 4 - 2
x + x⁻¹ = 2

(x + x⁻¹)² = 2²
x² + 2 . x . x⁻¹ + x⁻² = 4
x² + 2 . x¹⁻¹ + x⁻² = 4
x² + 2 + x⁻² = 4
x² + x⁻² = 4 - 2
x² + x⁻² = 2

jawabannya D