If x+1/x= 4 then x²+1/x²=?, Solve within 30sec Trick By Waseem Sir

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How to know when to apply this formula?

kausambib
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Formula which u have applied is wrong sir a+b whole sq.=a^2+b^2+2ab

poojanegi
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Can u do the question that
Q-If x+1/x =6 find x power 2 -1/x power 2

rkjamwalbhaktibhjan