(5/3) -2 the impossible

(5/3)^-2

A negative exponent means to move the term to the denominator and get rid of the negative sign.

= $\frac{1}{(5/3)^{2}}$

That is the same thing as:

= $\frac{1}{5^{2}/3^{2}}$

=$\frac{1}{25/9}$

=$1 / \frac{25}{9}$

Keep, change, flip

=$1 * \frac{9}{25}$

=$\frac{9}{25}$