Question

x+1/x=9,then x²+1/x²=?​
the answer is 79
please give me only solution

Answer 1

Answer:

79

Step-by-step explanation:

x + 1/x = 9

⇒ x² + 1/(x)² + 2 = 81

⇒ x² + 1/(x)² = 81 - 2

⇒ x² + 1/(x)² = 79

Hope it helps!!

Answer 2

x+1/x=9
Squaring on both sides
(x+1/x)^2==(9)^2
x2 + 1/x2 +2(x)*(1/x)== 81
x2 + 1/x2 +2== 81
x2 + 1/x2 === 81-2

x2 + 1/x2 === 79









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