Question

Plz answer this two question plz tommorow is my exam!!!!!!!!
i will mark you as brainliest​

Answer 1

Answer:

28.(x-1/x)^2

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

(x-1/x)^2=25

x-1/x=5.

x^3-1/x^3=(x-1/x)^3+3×x×1/x(x-1/x)

=125+3×5

= 140.

x^3-1/x^3=140.

29.For 1.32 bar

let x=1.322222.....

10x=13.2222

10x-x=13.22-1.32

9x=11.9

x=11.9/9 -(1.)

For0.35 bar

let x=0.3535....

100x=35.3535...

100x-x=35.35-0.35

99x=35

x=35/99. -(2)

Adding 1 and 2.,

You will get the answer.