Question 996707
2^x -10(2^-x) + 3 = 0
Multiply thru by 2^x
--> 2^(2x) + 3*2^x - 10 = 0
Sub u for 2^x
--> u^2 + 3u - 10 = 0
(u+5)*(u-2) = 0
---
u = 2^x = 2
x = 1
---------------------
2^x = -5 Ignore.