Question

If x=2+ underrot3 , then x²+1dividedx² is

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Answer 1

Answer:

14

Step-by-step explanation:

x=2+√3

x²=(2+√3)²

   =4+3+2*2*√3

    =7+4√3

1/x²=1/7+4√3

rationalising this , you will get

1/x²=7-4√3/7²-(4√3)²

     =7-4√3/49-48

     =7-4√3

∴x²+1/x²=7+4√3+7-4√3

             =14

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