Given: $\displaystyle 5^x+2^y = 2^x+5^y = \frac{7}{10}$ Find: $\displaystyle (x+y)^{-1}$ We've been covering exponential functions pretty extensively, but I don't have a clue how to start this problem.
Follow Math Help Forum on Facebook and Google+
Originally Posted by fizz Given: $\displaystyle 5^x+2^y = 2^x+5^y = \frac{7}{10}$ Find: $\displaystyle (x+y)^{-1}$ We've been covering exponential functions pretty extensively, but I don't have a clue how to start this problem. Notice that $\displaystyle \frac{7}{10}=2^{-1}+5^{-1}$.
View Tag Cloud