Mysha07 Mysha07

15-06-2020
Mathematics

contestada

x^2+1/x^2=18 find x-1/x

Respuesta :

LammettHash LammettHash

15-06-2020

Notice that

[tex]\left(x-\dfrac1x\right)^2=x^2-2+\dfrac1{x^2}=18-2=16[/tex]

which tells us

[tex]x-\dfrac1x=\pm4[/tex]

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