f4數學 (log個課)

有幾條數唔識計 唔該幫我計一計
係關於log個課架 thz!

solve the following exponential equations.

1. 5^x+1 + 5^x - 5^x-1 = 29

2. 3^x+3 - 2(3^x+2) + 3^x = 30

3. 2^2x - 5(2^x) +4 = 0

4.4^2x - 10(4^x) + 16 = 0

唔該晒!!!!