Question

do it like sum plz tell me fast ok

Answer 1

Its answer is 257/16

Answer 2

x+1/x  = 3

square on both sides,

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Formula used:-

(a+b)^2 = a^2 +b^2 +2ab

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Now,

(x+1/x)^2 = 3^2

x^2 +1/x^2 +2 = 9   [x*1/x = 1]

x^2 +1/x^2 = 9-2

x^2 +1/x^2 =7

Then, again square on both sides,

(x^2+1/x^2)^2 = 7^2

x^4 +1/x^4 +2= 49  [ x^2 *1/x^2 = 1]

x^4 +1/x^4 = 49-2


x^4 +1/x^4 = 47


i hope this will help you


-by ABHAY