Question

if x=5-2root 6,find the value of x^2+1/x^2​

Answer 1

Answer:

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Answer 2

Answer:

x=5-2√6

Then 1/x=5+2√6. ( by rationalization)

(5-2√6)²+(5+2√6)²

25+24-20√6+ 25+ 24+20√6

25+24+25+24

50+48

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