RRB Assistant Loco Pilot and Technician Model Paper 17 with key

© examsiri.com

Question : 38 of 75

Marks: +1, -0

If

(x+1/x)^2

= 3 then

x^3+1/x^3

= ?

3
27
0
9

Solution:

(x+1/x)

=

√3

Cubing on both side

x^3+1/x^3

+ 3x

1/x(x+1/x)

=

(√3)^2

x^3+1/x^3

+ 3

(√3)

=

3√3

∴

x^3+1/x^3

= 0

© examsiri.com

Go to Question:

Prev Question

Next Question