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(x + x^-1)^2 + 2
= x^2 + 2 + x^-2 + 2
= x^2 + x^-2 + 4
= 47 + 4 = 51
(x + x^-1)^2 + 2 = 51
(x + x^-1)^2 = 51 - 2
(x + x^-1)^2 = 49
x + x^-1 = √49 = 7
(x^1/2 + x^-1/2)^2 = 7 + 2
(x^1/2 + x^-1/2)^2 = 9
x^1/2 + x^-1/2 = √9 = 3
maka nilai x^1/2 + x^-1/2 = 3