SOLUTION: {{{(9/10) ^-2 }}} i cant figure this out because when theres a negative exponent there's certain rules. please help

Algebra ->  Exponents -> SOLUTION: {{{(9/10) ^-2 }}} i cant figure this out because when theres a negative exponent there's certain rules. please help       Log On


   

Question 314461: %289%2F10%29+%5E-2+
i cant figure this out because when theres a negative exponent there's certain rules.
please help
Answer by texttutoring(324) About Me  (Show Source):
You can put this solution on YOUR website!
When there is a negative exponent, all it means is that it becomes the reciprocal (flip the fraction)


For example, 9^(-2) = 1/9^2 = 1/81

So, if you have (9/10)^-2, it means you just flip the 9 and 10, and square both of them:

(9/10)^-2
=(10/9)^2
=100/81