If x+1/x = 5 find the value of following x2 + 1/x2
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answer: 23
explanation:
x + 1/x = 5
squaring both sides
( x + 1/x )^2 = 25
x^2 + 1/x2 +2 = 25
x^2 + 1/x^2 = 23
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