Question

Find the value of the sum
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Answer 1

Step-by-step explanation:

given x2+1/x2=18

x2+1/x2=16+2

x2+1/x2-2=16

(x -1/x)^2=16

(x-1/x)=4–––– (1)

we know that a^3 -b^3=(a-b) ( a^2+ab+b^2)

x^3-1/x^3= (x-1/x)(x2+x*1/x+1/x2)

= (x-1x) (x2+1+1/x2)

=4*(18+1) form (1)

= 4*19

= 76

Answer 2

Answer:

1/18

Step-by-step explanation:

follow these steps.