Question

if x=√5+2,then find the value of x²+1/x²​.
DEAR I DON'T UNDERSTAND WHAT U SAD.
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Answer 1

Answer:

18

Step-by-step explanation:

Given: x=√5+2

Find: x²+1/x²

Solution:

(√5+2)² = 9+4√5

1/((√5+2)²) = 1/(9+4√5)

9+4√5 + 1/(9+4√5) = 18