Question

f x + 1/x= 4 , then find X3 + (1/x)3.

Answer 1

Answer:

18

Step-by-step explanation:

x+1/x=3  

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

x^3+3.x^2.1/x+3.x.1/x^2+1/x^3=27

(x^3+1/x^3)+3.x^2.1/x+3.x.1/x^2=27

x^3+1/x^3+(3x+3/x)=27

x^3+1/x^3+3(x+1/x)=27

x^3+1/x^3+3×3=27

x^3+1/x^3+9=27

x^3 + 1/x^3 = 18.

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