Question

Tìm x biết: 2^x + 2^x+1 = 96

 

Answer 1

2^x + 2^x+1=96

2^x+2^x.2=96

2^x(1+2)=96

2^x.3=96

2^x=96:3

2^x=32

2^x=2^5

=>x=5

vậy x=5

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Answer 2

2^x + 2^{x + 1} = 96

=> 2^x + 2^x . 2 = 96

=> 2^x (1 + 2) = 96

=> 2^x . 3 = 96

=> 2^x = 32

=> 2^x = 2⁵

=> x = 5