Question

evaluate : {(2/5)^-1 - (3/4)^-1}^-2​

Answer 1

Answer:

Using identity : (a^m)^n = a^m × n

( 2/5 ^ -1 × - 2) - ( 3/4 ^ -1 × - 2)

2/ 5 ^ 2 - 3/4 ^ 2

4/25 - 9/16

64 - 225 / 400

- 161 /400.