If \sqrtx-1/\sqrtx=4, then x^2+1/x^2 is equal to:

SSC CHSL Model Paper 11

Question : 61 of 100

Marks: +1, -0

√x-1/√x=4

, then

x^2+1/x^2

is equal to:

Solution:

√x-1/√x=4

Squaring both sides,

⇒x+1/x-2=16

⇒x+1/x=18

Again squaring both sides,

⇒x^2+1/x^2+2=324

⇒x^2+1/x^2=322

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