Question

x+ 1/x=2
x4 - 1/x4=?

Answer 1

Answer:

x+1/x=2.

x+1=2x

1=2x-x

1=1x

x=1ans

Answer 2

Answer:

x+1/x=2

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

(x-1/x)^2+4.x.1/x=4

=> (x-1/x)^2=4-4=0

=> (x-1/x)=0

x^4-1/x^4

=(x^2)^2-(1/x^2)^2

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

={(x+1/x)^2-2.x.1/x}{(x)^2-(1/x)^2}

={2^2-2}(x+1/x)(x-1/x)

=(4-2)(2)(x-1/x)

=2.2.(x-1/x)

=4.0

=0