X2+1/x2=7 find the value of x+1/x
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Step-by-step explanation:
Given that
x2 + 1/x2 =7
Add '2' on both sides
x2 + 1/x2 + 2 = 7+2
x2 + 1/x2 + 2 x2 × 1/x2 = 9
As per the formula i.e.
(a+b)2 = a2 + b2 + 2ab
(x+1/x)2 = 9
(x+1/x) = √9
(x+1/x) = 3
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