Question

Tìm x:

2^x+2 -2^x =96

Answer 1

2^x+2 - 2^x = 96

=> 2^x.(2² - 1) = 96

=> 2^x.(4 - 1) = 96

=> 2^x.3 = 96

=> 2^x = 96 : 3 

=> 2^x = 32 = 2⁵

=> x = 5

Answer 2

2^x+2 - 2^x = 96

2^x+2 - 2^x = 2^7 - 2^5

=> x + 2 - x = 7 - 5

     x + 2 - x = (5 + 2) - 5

     Vậy x = 5.