Question

If a+1/a=5 then find

1)a-1/a
2)a^2+1/a^2
3)a^3-1/a^3

please answer quickly​

Answer 1

Answer:

a + 1/a = 5

a + 1 = 5a

1 = 4a

a= 1/4

1). 1/4 -1/1/4

1-4/4/1/4

-3/4*4/1

answer is -3

2).(1/4)^2 + 1/(1/4)^2

1/16 + 1/1/16

1+16/16/1/16

17/16*16/1

answer is 17

3).(1/4)^3 - 1/(1/4)^3

1/64 - 1/1/64

1-64/64/1/64

-63/64 * 64/1

answer is -63

hope it will help you