Question

if x²+1/x²=23,find the value of (x-1/x)

Answer 1

x²+1/x²-2(x)(1/x) = 21

(subtract 2 from both sides)

using formula , a²+b²-2ab = (a-b)²



(x-1/x)² = 21

=> (x-1/x) = √21


hope this helps