Question

if [x+1/x] =3 , then [x2+1/x2]=?

Answer 1

Answer:

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Answer 2

Answer:

X+1/x=3

(x+1/x)^2 =3^2

Formula=(a+b)^2 =a^2 +2ab+b^2

3^2 =x2+1/x2+2ab

9=x2+1/x2+2(a and B get cut)

9-2=x2+1/x2

X2+1/x2=7