Question Number 148711 by Rankut last updated on 30/Jul/21

if x+(1/x)=4, and x−(1/x)=3 then prove that 4=5

Answered by liberty last updated on 30/Jul/21

x^2 +(1/x^2 )+2=16⇒x^2 +(1/x^2 )=14 x^2 +(1/x^2 )−2=9⇒x^2 +(1/x^2 )=11 then 14=11

Answered by liberty last updated on 30/Jul/21

x+(1/x)=4 x−(1/x)=3 ⇒x=(7/2) ∧(1/x)=(1/2) ⇒(7/2)=2 or 7=4