Question

Tìm x, biết

2^x + 2^x+3 =144

 

Answer 1

\(2^x+2^{x+3}=144\)

=> \(2^x.\left(1+2^3\right)=144\)

=> \(2^x.\left(1+8\right)=144\)

=> \(2^x.9=144\)

=> \(2^x=144:9\)

=> \(2^x=16\)

=> \(2^x=2^4\)

=> \(x=4\)

Answer 2

Ta co : 

2^x+2^x+3=144

2^x.1+2^x.2^3=144

2^x(1+2^3)=144

2^x.9=144

2^x=144:9

2^x=16

Ma :2^x=2^4

=>x=4

****