Question

if=3+2√2, find the value of(x²+1/x²)
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Answer 1

Answer:

15 + 12root2

x^2 + 1/x^2 = (x + 1/x)^2 - 2                                        [using identity]

= (3 + 2root2)^2 - 2

= 15 + 12root2