Math, asked by aswinkarthickpm, 4 months ago

If x = 2 + √5 , prove that x square + 1 / xs quare =18

Answers

Answered by sanchghosh9

1

Step-by-step explanation:

x=2+√5

x²=9+4√5

1/x=√5-2

1/X²=9-4√5

x²+1/x²=9+4√5+9-4√5

=18

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