if x=5-√21/2 prove that (x+1/x ) -5(x^2+1/x^2)+(x^3+1/x^3)=0
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Answered by
39
Hi .....dear......
here is your answer!! .
..
let's start....
first of all we need to find reciprocal of x .
.which is 2/(5-√21)...
now multiply denominator with its conjugate...
on simplying we get 1/x= (5+√21)/2.....
now find the x +1/x.....
..as solved in Given picture.....
.we get 5 ...
....now see the picture for further solution.....
here is your answer!! .
..
let's start....
first of all we need to find reciprocal of x .
.which is 2/(5-√21)...
now multiply denominator with its conjugate...
on simplying we get 1/x= (5+√21)/2.....
now find the x +1/x.....
..as solved in Given picture.....
.we get 5 ...
....now see the picture for further solution.....
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Answered by
22
The answer is provided in the attachment.
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