tomorrow I'll be taking a test on exponential growth, things like the growth rates of bacteria. the basic formula that we're using is Y=a(b)^x/c. I am fine with this on till we start adding negatives to the mix. for example
I understand that the base(6) is going to be multiplied by the factor(2) and although i partially understand how to punch a fraction for an exponent into the calculator, i don't understand exactly how it works, and when the fraction becomes a negative, my calculator answer dos not come out correct ether.
Also note that 2^(-4/6) = 1/2^(4/6) using a well known index law.
It is impossible to know what your real problem is but it probably boils down to incorrect data entry on your calculator. Run it past your teacher.