If this is h^-2=(1/5)^-2 then h=1/5 must be a solution because the equation consists of a quantity on each side being raised to the same power. We can also write 1/h^2=5^2 because 1/(1/5)=5. This makes the exponents positive. Taking square roots of each side we have 1/h=5 or 1/h=-5 because -5 squared is the same as 5 squared=25. So another solution is h=-1/5.