x²-5x+1=0 then x²+1/x²=
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Answer:
x²-5x+1=0
x²+1=5x
dividing both side by x
x²/x+ 1/ x= 5x/x
x+1/x=5
your answer is 5
Answered by
4
We know ,
Here ,
- a = x
- b = 1/x
Putting values , we get..
OTHER IMPORTANT IDENTITIES :-
- ( a - b )² = a² - 2ab + b²
- ( a + b ) ( a - b ) = a² - b²
- ( a + x ) ( a + y ) = a² + ( x + y )a + xy
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