TS Police Constable Telugu Model Paper 6

Question : 67 of 200

Marks: +1, -0

2x+2/x=3

అయిన

x^3+1/x^3+2=?

Solution:

2x+2/x=3

2(x+1/x)=3

x+1/x=3/2

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

x^3+1/x^3+33/2=27/8

x^3+1/x^3=27/8-9/2

x^3+1/x^3=-9/8

∴x^3+1/x^3+2=-9/8+2

=7/8

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