Question

Simplify please...
this is of powers and exponent​

Answer 1

Answer:

21

Step-by-step explanation:

1/3^-2

=> 3^2

1/2^-2

=> 2^2

1/4^-2

=> 4^2

= (3^2)-(2^2)+4^2

=> (9-4)+16

=> 21

Thanks