Find the value of x^2 + 1/x^2, if x – 1/x = √7
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Answer:
If x-1/x=7 then find the value of x2 +1/x2
x²+1/x² = 51. Explanation:
______________________ We know the algebraic identity:
a²+b²-2ab = (a-b)² Or.
______________________ Now,
= (x-1/x)²+2*x*(1/x)
= 7²+2 [ from (1)]
= 51. Therefore,
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Oct 21, 2017
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